diff --git a/CHANGES.md b/CHANGES.md
index fee60cfab7..eada6082b9 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -20,7 +20,7 @@ Build 🧱:
  -
 
 Other changes:
- -
+ - Performance: share Realm instance used on UI thread and improve SharedPreferences reading time.
 
 Changes in Element 1.0.6 (2020-09-08)
 ===================================================
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/RealmInstanceWrapper.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/RealmInstanceWrapper.kt
new file mode 100644
index 0000000000..e2ddbcbca8
--- /dev/null
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/RealmInstanceWrapper.kt
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.matrix.android.sdk.internal.database
+
+import io.realm.Realm
+import java.io.Closeable
+
+internal class RealmInstanceWrapper(private val realm: Realm, private val closeRealmOnClose: Boolean) : Closeable {
+
+    override fun close() {
+        if (closeRealmOnClose) {
+            realm.close()
+        }
+    }
+
+    fun <R> withRealm(block: (Realm) -> R): R {
+        return use {
+            block(it.realm)
+        }
+    }
+}
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/RealmSessionProvider.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/RealmSessionProvider.kt
new file mode 100644
index 0000000000..a7f934ffc0
--- /dev/null
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/RealmSessionProvider.kt
@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.matrix.android.sdk.internal.database
+
+import android.os.Looper
+import androidx.annotation.MainThread
+import com.zhuinden.monarchy.Monarchy
+import io.realm.Realm
+import org.matrix.android.sdk.internal.di.SessionDatabase
+import org.matrix.android.sdk.internal.session.SessionLifecycleObserver
+import org.matrix.android.sdk.internal.session.SessionScope
+import javax.inject.Inject
+import kotlin.concurrent.getOrSet
+
+/**
+ * This class keeps an instance of realm open in the main thread so you can grab it whenever you want to get a realm
+ * instance. This does check each time if you are on the main thread or not and returns the appropriate realm instance.
+ */
+@SessionScope
+internal class RealmSessionProvider @Inject constructor(@SessionDatabase private val monarchy: Monarchy)
+    : SessionLifecycleObserver {
+
+    private val realmThreadLocal = ThreadLocal<Realm>()
+
+    /**
+     * Allow you to execute a block with an opened realm. It automatically closes it if necessary (ie. when not in main thread)
+     */
+    fun <R> withRealm(block: (Realm) -> R): R {
+        return getRealmWrapper().withRealm(block)
+    }
+
+    @MainThread
+    override fun onStart() {
+        realmThreadLocal.getOrSet {
+            Realm.getInstance(monarchy.realmConfiguration)
+        }
+    }
+
+    @MainThread
+    override fun onStop() {
+        realmThreadLocal.get()?.close()
+        realmThreadLocal.remove()
+    }
+
+    private fun getRealmWrapper(): RealmInstanceWrapper {
+        val isOnMainThread = isOnMainThread()
+        val realm = if (isOnMainThread) {
+            realmThreadLocal.getOrSet {
+                Realm.getInstance(monarchy.realmConfiguration)
+            }
+        } else {
+            Realm.getInstance(monarchy.realmConfiguration)
+        }
+        return RealmInstanceWrapper(realm, closeRealmOnClose = !isOnMainThread)
+    }
+
+    private fun isOnMainThread() = Looper.myLooper() == Looper.getMainLooper()
+}
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/mapper/ReadReceiptsSummaryMapper.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/mapper/ReadReceiptsSummaryMapper.kt
index 188ca4937c..6b9c0e7a45 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/mapper/ReadReceiptsSummaryMapper.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/mapper/ReadReceiptsSummaryMapper.kt
@@ -18,26 +18,24 @@
 package org.matrix.android.sdk.internal.database.mapper
 
 import org.matrix.android.sdk.api.session.room.model.ReadReceipt
+import org.matrix.android.sdk.internal.database.RealmSessionProvider
 import org.matrix.android.sdk.internal.database.model.ReadReceiptsSummaryEntity
 import org.matrix.android.sdk.internal.database.model.UserEntity
 import org.matrix.android.sdk.internal.database.query.where
-import org.matrix.android.sdk.internal.di.SessionDatabase
-import io.realm.Realm
-import io.realm.RealmConfiguration
 import javax.inject.Inject
 
-internal class ReadReceiptsSummaryMapper @Inject constructor(@SessionDatabase private val realmConfiguration: RealmConfiguration) {
+internal class ReadReceiptsSummaryMapper @Inject constructor(private val realmSessionProvider: RealmSessionProvider) {
 
     fun map(readReceiptsSummaryEntity: ReadReceiptsSummaryEntity?): List<ReadReceipt> {
         if (readReceiptsSummaryEntity == null) {
             return emptyList()
         }
-        return Realm.getInstance(realmConfiguration).use { realm ->
+        return realmSessionProvider.withRealm { realm ->
             val readReceipts = readReceiptsSummaryEntity.readReceipts
             readReceipts
                     .mapNotNull {
                         val user = UserEntity.where(realm, it.userId).findFirst()
-                                   ?: return@mapNotNull null
+                                ?: return@mapNotNull null
                         ReadReceipt(user.asDomain(), it.originServerTs.toLong())
                     }
         }
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/SessionModule.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/SessionModule.kt
index d404cecc51..5397b8d9bd 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/SessionModule.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/SessionModule.kt
@@ -47,6 +47,7 @@ import org.matrix.android.sdk.internal.crypto.secrets.DefaultSharedSecretStorage
 import org.matrix.android.sdk.internal.crypto.verification.VerificationMessageProcessor
 import org.matrix.android.sdk.internal.database.DatabaseCleaner
 import org.matrix.android.sdk.internal.database.EventInsertLiveObserver
+import org.matrix.android.sdk.internal.database.RealmSessionProvider
 import org.matrix.android.sdk.internal.database.SessionRealmConfigurationFactory
 import org.matrix.android.sdk.internal.di.Authenticated
 import org.matrix.android.sdk.internal.di.DeviceId
@@ -325,23 +326,27 @@ internal abstract class SessionModule {
 
     @Binds
     @IntoSet
-    abstract fun bindIntegrationManager(observer: IntegrationManager): SessionLifecycleObserver
+    abstract fun bindIntegrationManager(manager: IntegrationManager): SessionLifecycleObserver
 
     @Binds
     @IntoSet
-    abstract fun bindWidgetUrlFormatter(observer: DefaultWidgetURLFormatter): SessionLifecycleObserver
+    abstract fun bindWidgetUrlFormatter(formatter: DefaultWidgetURLFormatter): SessionLifecycleObserver
 
     @Binds
     @IntoSet
-    abstract fun bindShieldTrustUpdated(observer: ShieldTrustUpdater): SessionLifecycleObserver
+    abstract fun bindShieldTrustUpdated(updater: ShieldTrustUpdater): SessionLifecycleObserver
 
     @Binds
     @IntoSet
-    abstract fun bindIdentityService(observer: DefaultIdentityService): SessionLifecycleObserver
+    abstract fun bindIdentityService(service: DefaultIdentityService): SessionLifecycleObserver
 
     @Binds
     @IntoSet
-    abstract fun bindDatabaseCleaner(observer: DatabaseCleaner): SessionLifecycleObserver
+    abstract fun bindDatabaseCleaner(cleaner: DatabaseCleaner): SessionLifecycleObserver
+
+    @Binds
+    @IntoSet
+    abstract fun bindRealmSessionProvider(provider: RealmSessionProvider): SessionLifecycleObserver
 
     @Binds
     abstract fun bindInitialSyncProgressService(service: DefaultInitialSyncProgressService): InitialSyncProgressService
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/RoomGetter.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/RoomGetter.kt
index 38dcad2311..985cf80e97 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/RoomGetter.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/RoomGetter.kt
@@ -17,17 +17,16 @@
 
 package org.matrix.android.sdk.internal.session.room
 
-import com.zhuinden.monarchy.Monarchy
+import io.realm.Realm
 import org.matrix.android.sdk.api.session.room.Room
 import org.matrix.android.sdk.api.session.room.model.Membership
+import org.matrix.android.sdk.internal.database.RealmSessionProvider
 import org.matrix.android.sdk.internal.database.model.RoomEntity
 import org.matrix.android.sdk.internal.database.model.RoomSummaryEntity
 import org.matrix.android.sdk.internal.database.model.RoomSummaryEntityFields
 import org.matrix.android.sdk.internal.database.query.where
-import org.matrix.android.sdk.internal.di.SessionDatabase
 import org.matrix.android.sdk.internal.session.SessionScope
 import org.matrix.android.sdk.internal.session.room.membership.RoomMemberHelper
-import io.realm.Realm
 import javax.inject.Inject
 
 internal interface RoomGetter {
@@ -38,18 +37,18 @@ internal interface RoomGetter {
 
 @SessionScope
 internal class DefaultRoomGetter @Inject constructor(
-        @SessionDatabase private val monarchy: Monarchy,
+        private val realmSessionProvider: RealmSessionProvider,
         private val roomFactory: RoomFactory
 ) : RoomGetter {
 
     override fun getRoom(roomId: String): Room? {
-        return Realm.getInstance(monarchy.realmConfiguration).use { realm ->
+        return realmSessionProvider.withRealm { realm ->
             createRoom(realm, roomId)
         }
     }
 
     override fun getDirectRoomWith(otherUserId: String): Room? {
-        return Realm.getInstance(monarchy.realmConfiguration).use { realm ->
+        return realmSessionProvider.withRealm { realm ->
             RoomSummaryEntity.where(realm)
                     .equalTo(RoomSummaryEntityFields.IS_DIRECT, true)
                     .equalTo(RoomSummaryEntityFields.MEMBERSHIP_STR, Membership.JOIN.name)
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/send/LocalEchoRepository.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/send/LocalEchoRepository.kt
index b3188883c0..00c624a20d 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/send/LocalEchoRepository.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/send/LocalEchoRepository.kt
@@ -18,6 +18,7 @@
 package org.matrix.android.sdk.internal.session.room.send
 
 import com.zhuinden.monarchy.Monarchy
+import org.greenrobot.eventbus.EventBus
 import org.matrix.android.sdk.api.session.events.model.Content
 import org.matrix.android.sdk.api.session.events.model.Event
 import org.matrix.android.sdk.api.session.events.model.EventType
@@ -27,6 +28,7 @@ import org.matrix.android.sdk.api.session.room.model.message.MessageType
 import org.matrix.android.sdk.api.session.room.send.SendState
 import org.matrix.android.sdk.api.session.room.timeline.TimelineEvent
 import org.matrix.android.sdk.internal.crypto.MXEventDecryptionResult
+import org.matrix.android.sdk.internal.database.RealmSessionProvider
 import org.matrix.android.sdk.internal.database.helper.nextId
 import org.matrix.android.sdk.internal.database.mapper.ContentMapper
 import org.matrix.android.sdk.internal.database.mapper.TimelineEventMapper
@@ -43,12 +45,11 @@ import org.matrix.android.sdk.internal.session.room.membership.RoomMemberHelper
 import org.matrix.android.sdk.internal.session.room.summary.RoomSummaryUpdater
 import org.matrix.android.sdk.internal.session.room.timeline.DefaultTimeline
 import org.matrix.android.sdk.internal.util.awaitTransaction
-import io.realm.Realm
-import org.greenrobot.eventbus.EventBus
 import timber.log.Timber
 import javax.inject.Inject
 
 internal class LocalEchoRepository @Inject constructor(@SessionDatabase private val monarchy: Monarchy,
+                                                       private val realmSessionProvider: RealmSessionProvider,
                                                        private val roomSummaryUpdater: RoomSummaryUpdater,
                                                        private val eventBus: EventBus,
                                                        private val timelineEventMapper: TimelineEventMapper) {
@@ -59,7 +60,7 @@ internal class LocalEchoRepository @Inject constructor(@SessionDatabase private
         if (event.eventId == null) {
             throw IllegalStateException("You should have set an eventId for your event")
         }
-        val timelineEventEntity = Realm.getInstance(monarchy.realmConfiguration).use { realm ->
+        val timelineEventEntity = realmSessionProvider.withRealm { realm ->
             val eventEntity = event.toEntity(roomId, SendState.UNSENT, System.currentTimeMillis())
             val roomMemberHelper = RoomMemberHelper(realm, roomId)
             val myUser = roomMemberHelper.getLastRoomMember(senderId)
@@ -150,7 +151,7 @@ internal class LocalEchoRepository @Inject constructor(@SessionDatabase private
     }
 
     fun getAllEventsWithStates(roomId: String, states : List<SendState>): List<TimelineEvent> {
-        return Realm.getInstance(monarchy.realmConfiguration).use { realm ->
+        return realmSessionProvider.withRealm { realm ->
             TimelineEventEntity
                     .findAllInRoomWithSendStates(realm, roomId, states)
                     .sortedByDescending { it.displayIndex }
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/state/StateEventDataSource.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/state/StateEventDataSource.kt
index e8dc2ddf40..65d30868d8 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/state/StateEventDataSource.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/state/StateEventDataSource.kt
@@ -20,24 +20,26 @@ package org.matrix.android.sdk.internal.session.room.state
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.Transformations
 import com.zhuinden.monarchy.Monarchy
+import io.realm.Realm
+import io.realm.RealmQuery
+import io.realm.kotlin.where
 import org.matrix.android.sdk.api.query.QueryStringValue
 import org.matrix.android.sdk.api.session.events.model.Event
 import org.matrix.android.sdk.api.util.Optional
 import org.matrix.android.sdk.api.util.toOptional
+import org.matrix.android.sdk.internal.database.RealmSessionProvider
 import org.matrix.android.sdk.internal.database.mapper.asDomain
 import org.matrix.android.sdk.internal.database.model.CurrentStateEventEntity
 import org.matrix.android.sdk.internal.database.model.CurrentStateEventEntityFields
 import org.matrix.android.sdk.internal.di.SessionDatabase
 import org.matrix.android.sdk.internal.query.process
-import io.realm.Realm
-import io.realm.RealmQuery
-import io.realm.kotlin.where
 import javax.inject.Inject
 
-internal class StateEventDataSource @Inject constructor(@SessionDatabase private val monarchy: Monarchy) {
+internal class StateEventDataSource @Inject constructor(@SessionDatabase private val monarchy: Monarchy,
+                                                        private val realmSessionProvider: RealmSessionProvider) {
 
     fun getStateEvent(roomId: String, eventType: String, stateKey: QueryStringValue): Event? {
-        return Realm.getInstance(monarchy.realmConfiguration).use { realm ->
+        return realmSessionProvider.withRealm { realm ->
             buildStateEventQuery(realm, roomId, setOf(eventType), stateKey).findFirst()?.root?.asDomain()
         }
     }
@@ -53,7 +55,7 @@ internal class StateEventDataSource @Inject constructor(@SessionDatabase private
     }
 
     fun getStateEvents(roomId: String, eventTypes: Set<String>, stateKey: QueryStringValue): List<Event> {
-        return Realm.getInstance(monarchy.realmConfiguration).use { realm ->
+        return realmSessionProvider.withRealm { realm ->
             buildStateEventQuery(realm, roomId, eventTypes, stateKey)
                     .findAll()
                     .mapNotNull {
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/timeline/DefaultTimeline.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/timeline/DefaultTimeline.kt
index 421cd1b063..52651af881 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/timeline/DefaultTimeline.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/timeline/DefaultTimeline.kt
@@ -39,6 +39,7 @@ import org.matrix.android.sdk.api.session.room.timeline.Timeline
 import org.matrix.android.sdk.api.session.room.timeline.TimelineEvent
 import org.matrix.android.sdk.api.session.room.timeline.TimelineSettings
 import org.matrix.android.sdk.api.util.CancelableBag
+import org.matrix.android.sdk.internal.database.RealmSessionProvider
 import org.matrix.android.sdk.internal.database.mapper.TimelineEventMapper
 import org.matrix.android.sdk.internal.database.model.ChunkEntity
 import org.matrix.android.sdk.internal.database.model.ChunkEntityFields
@@ -76,7 +77,8 @@ internal class DefaultTimeline(
         private val settings: TimelineSettings,
         private val hiddenReadReceipts: TimelineHiddenReadReceipts,
         private val eventBus: EventBus,
-        private val eventDecryptor: TimelineEventDecryptor
+        private val eventDecryptor: TimelineEventDecryptor,
+        private val realmSessionProvider: RealmSessionProvider
 ) : Timeline, TimelineHiddenReadReceipts.Delegate {
 
     data class OnNewTimelineEvents(val roomId: String, val eventIds: List<String>)
@@ -136,13 +138,13 @@ internal class DefaultTimeline(
     }
 
     override fun pendingEventCount(): Int {
-        return Realm.getInstance(realmConfiguration).use {
+        return realmSessionProvider.withRealm {
             RoomEntity.where(it, roomId).findFirst()?.sendingTimelineEvents?.count() ?: 0
         }
     }
 
     override fun failedToDeliverEventCount(): Int {
-        return Realm.getInstance(realmConfiguration).use {
+        return realmSessionProvider.withRealm {
             TimelineEventEntity.findAllInRoomWithSendStates(it, roomId, SendState.HAS_FAILED_STATES).count()
         }
     }
@@ -239,7 +241,7 @@ internal class DefaultTimeline(
             return eventId
         }
         // Otherwise, we should check if the event is in the db, but is hidden because of filters
-        return Realm.getInstance(realmConfiguration).use { localRealm ->
+        return realmSessionProvider.withRealm { localRealm ->
             val nonFilteredEvents = buildEventQuery(localRealm)
                     .sort(TimelineEventEntityFields.DISPLAY_INDEX, Sort.DESCENDING)
                     .findAll()
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/timeline/DefaultTimelineService.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/timeline/DefaultTimelineService.kt
index db675f69f5..c60a944409 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/timeline/DefaultTimelineService.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/timeline/DefaultTimelineService.kt
@@ -22,6 +22,9 @@ import androidx.lifecycle.Transformations
 import com.squareup.inject.assisted.Assisted
 import com.squareup.inject.assisted.AssistedInject
 import com.zhuinden.monarchy.Monarchy
+import io.realm.Sort
+import io.realm.kotlin.where
+import org.greenrobot.eventbus.EventBus
 import org.matrix.android.sdk.api.session.events.model.isImageMessage
 import org.matrix.android.sdk.api.session.events.model.isVideoMessage
 import org.matrix.android.sdk.api.session.room.timeline.Timeline
@@ -30,7 +33,7 @@ import org.matrix.android.sdk.api.session.room.timeline.TimelineService
 import org.matrix.android.sdk.api.session.room.timeline.TimelineSettings
 import org.matrix.android.sdk.api.util.Optional
 import org.matrix.android.sdk.api.util.toOptional
-import org.matrix.android.sdk.internal.crypto.store.db.doWithRealm
+import org.matrix.android.sdk.internal.database.RealmSessionProvider
 import org.matrix.android.sdk.internal.database.mapper.ReadReceiptsSummaryMapper
 import org.matrix.android.sdk.internal.database.mapper.TimelineEventMapper
 import org.matrix.android.sdk.internal.database.model.TimelineEventEntity
@@ -38,13 +41,10 @@ import org.matrix.android.sdk.internal.database.model.TimelineEventEntityFields
 import org.matrix.android.sdk.internal.database.query.where
 import org.matrix.android.sdk.internal.di.SessionDatabase
 import org.matrix.android.sdk.internal.task.TaskExecutor
-import org.matrix.android.sdk.internal.util.fetchCopyMap
-import io.realm.Sort
-import io.realm.kotlin.where
-import org.greenrobot.eventbus.EventBus
 
 internal class DefaultTimelineService @AssistedInject constructor(@Assisted private val roomId: String,
                                                                   @SessionDatabase private val monarchy: Monarchy,
+                                                                  private val realmSessionProvider: RealmSessionProvider,
                                                                   private val eventBus: EventBus,
                                                                   private val taskExecutor: TaskExecutor,
                                                                   private val contextOfEventTask: GetContextOfEventTask,
@@ -73,17 +73,17 @@ internal class DefaultTimelineService @AssistedInject constructor(@Assisted priv
                 hiddenReadReceipts = TimelineHiddenReadReceipts(readReceiptsSummaryMapper, roomId, settings),
                 eventBus = eventBus,
                 eventDecryptor = eventDecryptor,
-                fetchTokenAndPaginateTask = fetchTokenAndPaginateTask
+                fetchTokenAndPaginateTask = fetchTokenAndPaginateTask,
+                realmSessionProvider = realmSessionProvider
         )
     }
 
     override fun getTimeLineEvent(eventId: String): TimelineEvent? {
-        return monarchy
-                .fetchCopyMap({
-                    TimelineEventEntity.where(it, roomId = roomId, eventId = eventId).findFirst()
-                }, { entity, _ ->
-                    timelineEventMapper.map(entity)
-                })
+        return realmSessionProvider.withRealm { realm ->
+            TimelineEventEntity.where(realm, roomId = roomId, eventId = eventId).findFirst()?.let {
+                timelineEventMapper.map(it)
+            }
+        }
     }
 
     override fun getTimeLineEventLive(eventId: String): LiveData<Optional<TimelineEvent>> {
@@ -98,7 +98,7 @@ internal class DefaultTimelineService @AssistedInject constructor(@Assisted priv
 
     override fun getAttachmentMessages(): List<TimelineEvent> {
         // TODO pretty bad query.. maybe we should denormalize clear type in base?
-        return doWithRealm(monarchy.realmConfiguration) { realm ->
+        return realmSessionProvider.withRealm { realm ->
             realm.where<TimelineEventEntity>()
                     .equalTo(TimelineEventEntityFields.ROOM_ID, roomId)
                     .sort(TimelineEventEntityFields.DISPLAY_INDEX, Sort.ASCENDING)
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/user/UserDataSource.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/user/UserDataSource.kt
index dd3c6856c0..f6cb86c0ed 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/user/UserDataSource.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/user/UserDataSource.kt
@@ -23,9 +23,11 @@ import androidx.paging.DataSource
 import androidx.paging.LivePagedListBuilder
 import androidx.paging.PagedList
 import com.zhuinden.monarchy.Monarchy
+import io.realm.Case
 import org.matrix.android.sdk.api.session.user.model.User
 import org.matrix.android.sdk.api.util.Optional
 import org.matrix.android.sdk.api.util.toOptional
+import org.matrix.android.sdk.internal.database.RealmSessionProvider
 import org.matrix.android.sdk.internal.database.mapper.asDomain
 import org.matrix.android.sdk.internal.database.model.IgnoredUserEntity
 import org.matrix.android.sdk.internal.database.model.IgnoredUserEntityFields
@@ -33,11 +35,10 @@ import org.matrix.android.sdk.internal.database.model.UserEntity
 import org.matrix.android.sdk.internal.database.model.UserEntityFields
 import org.matrix.android.sdk.internal.database.query.where
 import org.matrix.android.sdk.internal.di.SessionDatabase
-import org.matrix.android.sdk.internal.util.fetchCopied
-import io.realm.Case
 import javax.inject.Inject
 
-internal class UserDataSource @Inject constructor(@SessionDatabase private val monarchy: Monarchy) {
+internal class UserDataSource @Inject constructor(@SessionDatabase private val monarchy: Monarchy,
+                                                  private val realmSessionProvider: RealmSessionProvider) {
 
     private val realmDataSourceFactory: Monarchy.RealmDataSourceFactory<UserEntity> by lazy {
         monarchy.createDataSourceFactory { realm ->
@@ -58,10 +59,10 @@ internal class UserDataSource @Inject constructor(@SessionDatabase private val m
     }
 
     fun getUser(userId: String): User? {
-        val userEntity = monarchy.fetchCopied { UserEntity.where(it, userId).findFirst() }
-                ?: return null
-
-        return userEntity.asDomain()
+        return realmSessionProvider.withRealm {
+            val userEntity = UserEntity.where(it, userId).findFirst()
+            userEntity?.asDomain()
+        }
     }
 
     fun getUserLive(userId: String): LiveData<Optional<User>> {
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/user/accountdata/AccountDataDataSource.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/user/accountdata/AccountDataDataSource.kt
index d54bfdd63d..a9261eddab 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/user/accountdata/AccountDataDataSource.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/user/accountdata/AccountDataDataSource.kt
@@ -20,18 +20,20 @@ package org.matrix.android.sdk.internal.session.user.accountdata
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.Transformations
 import com.zhuinden.monarchy.Monarchy
+import io.realm.Realm
+import io.realm.RealmQuery
+import org.matrix.android.sdk.api.session.accountdata.UserAccountDataEvent
 import org.matrix.android.sdk.api.util.Optional
 import org.matrix.android.sdk.api.util.toOptional
+import org.matrix.android.sdk.internal.database.RealmSessionProvider
 import org.matrix.android.sdk.internal.database.mapper.AccountDataMapper
 import org.matrix.android.sdk.internal.database.model.UserAccountDataEntity
 import org.matrix.android.sdk.internal.database.model.UserAccountDataEntityFields
 import org.matrix.android.sdk.internal.di.SessionDatabase
-import org.matrix.android.sdk.api.session.accountdata.UserAccountDataEvent
-import io.realm.Realm
-import io.realm.RealmQuery
 import javax.inject.Inject
 
 internal class AccountDataDataSource @Inject constructor(@SessionDatabase private val monarchy: Monarchy,
+                                                         private val realmSessionProvider: RealmSessionProvider,
                                                          private val accountDataMapper: AccountDataMapper) {
 
     fun getAccountDataEvent(type: String): UserAccountDataEvent? {
@@ -45,10 +47,9 @@ internal class AccountDataDataSource @Inject constructor(@SessionDatabase privat
     }
 
     fun getAccountDataEvents(types: Set<String>): List<UserAccountDataEvent> {
-        return monarchy.fetchAllMappedSync(
-                { accountDataEventsQuery(it, types) },
-                accountDataMapper::map
-        )
+        return realmSessionProvider.withRealm {
+            accountDataEventsQuery(it, types).findAll().map(accountDataMapper::map)
+        }
     }
 
     fun getLiveAccountDataEvents(types: Set<String>): LiveData<List<UserAccountDataEvent>> {
diff --git a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/widgets/helper/WidgetFactory.kt b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/widgets/helper/WidgetFactory.kt
index 2cbc9b23dc..992dbf16df 100644
--- a/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/widgets/helper/WidgetFactory.kt
+++ b/matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/widgets/helper/WidgetFactory.kt
@@ -23,17 +23,15 @@ import org.matrix.android.sdk.api.session.room.sender.SenderInfo
 import org.matrix.android.sdk.api.session.widgets.model.Widget
 import org.matrix.android.sdk.api.session.widgets.model.WidgetContent
 import org.matrix.android.sdk.api.session.widgets.model.WidgetType
-import org.matrix.android.sdk.internal.di.SessionDatabase
+import org.matrix.android.sdk.internal.database.RealmSessionProvider
 import org.matrix.android.sdk.internal.di.UserId
 import org.matrix.android.sdk.internal.session.room.membership.RoomMemberHelper
 import org.matrix.android.sdk.internal.session.user.UserDataSource
-import io.realm.Realm
-import io.realm.RealmConfiguration
 import java.net.URLEncoder
 import javax.inject.Inject
 
-internal class WidgetFactory @Inject constructor(@SessionDatabase private val realmConfiguration: RealmConfiguration,
-                                                 private val userDataSource: UserDataSource,
+internal class WidgetFactory @Inject constructor(private val userDataSource: UserDataSource,
+                                                 private val realmSessionProvider: RealmSessionProvider,
                                                  @UserId private val userId: String) {
 
     fun create(widgetEvent: Event): Widget? {
@@ -44,7 +42,7 @@ internal class WidgetFactory @Inject constructor(@SessionDatabase private val re
         val senderInfo = if (widgetEvent.senderId == null || widgetEvent.roomId == null) {
             null
         } else {
-            Realm.getInstance(realmConfiguration).use {
+            realmSessionProvider.withRealm {
                 val roomMemberHelper = RoomMemberHelper(it, widgetEvent.roomId)
                 val roomMemberSummaryEntity = roomMemberHelper.getLastRoomMember(widgetEvent.senderId)
                 SenderInfo(
diff --git a/tools/check/forbidden_strings_in_code.txt b/tools/check/forbidden_strings_in_code.txt
index 0a58175731..ebe877b301 100644
--- a/tools/check/forbidden_strings_in_code.txt
+++ b/tools/check/forbidden_strings_in_code.txt
@@ -172,3 +172,6 @@ import org.matrix.androidsdk.crypto.data===2
 
 ### Use `Context#getSystemService` extension function provided by `core-ktx`
 getSystemService\(Context
+
+### Use DefaultSharedPreferences.getInstance() instead for better performance
+PreferenceManager\.getDefaultSharedPreferences==2
diff --git a/vector/build.gradle b/vector/build.gradle
index 6b251d5329..e0f401aaf6 100644
--- a/vector/build.gradle
+++ b/vector/build.gradle
@@ -190,6 +190,8 @@ android {
 
             resValue "bool", "debug_mode", "true"
             buildConfigField "boolean", "LOW_PRIVACY_LOG_ENABLE", "false"
+            // Set to true if you want to enable strict mode in debug
+            buildConfigField "boolean", "ENABLE_STRICT_MODE_LOGS", "false"
 
             signingConfig signingConfigs.debug
         }
@@ -199,6 +201,7 @@ android {
 
             resValue "bool", "debug_mode", "false"
             buildConfigField "boolean", "LOW_PRIVACY_LOG_ENABLE", "false"
+            buildConfigField "boolean", "ENABLE_STRICT_MODE_LOGS", "false"
 
             postprocessing {
                 removeUnusedCode true
diff --git a/vector/src/debug/java/im/vector/app/receivers/DebugReceiver.kt b/vector/src/debug/java/im/vector/app/receivers/DebugReceiver.kt
index 7b64bed08e..0cea9e3d8e 100644
--- a/vector/src/debug/java/im/vector/app/receivers/DebugReceiver.kt
+++ b/vector/src/debug/java/im/vector/app/receivers/DebugReceiver.kt
@@ -22,7 +22,7 @@ import android.content.Intent
 import android.content.IntentFilter
 import android.content.SharedPreferences
 import androidx.core.content.edit
-import androidx.preference.PreferenceManager
+import im.vector.app.core.di.DefaultSharedPreferences
 import im.vector.app.core.utils.lsFiles
 import timber.log.Timber
 
@@ -44,7 +44,7 @@ class DebugReceiver : BroadcastReceiver() {
     }
 
     private fun dumpPreferences(context: Context) {
-        logPrefs("DefaultSharedPreferences", PreferenceManager.getDefaultSharedPreferences(context))
+        logPrefs("DefaultSharedPreferences", DefaultSharedPreferences.getInstance(context))
     }
 
     private fun logPrefs(name: String, sharedPreferences: SharedPreferences?) {
@@ -58,7 +58,7 @@ class DebugReceiver : BroadcastReceiver() {
     }
 
     private fun alterScalarToken(context: Context) {
-        PreferenceManager.getDefaultSharedPreferences(context).edit {
+        DefaultSharedPreferences.getInstance(context).edit {
             // putString("SCALAR_TOKEN_PREFERENCE_KEY" + Matrix.getInstance(context).defaultSession.myUserId, "bad_token")
         }
     }
diff --git a/vector/src/gplay/java/im/vector/app/push/fcm/FcmHelper.kt b/vector/src/gplay/java/im/vector/app/push/fcm/FcmHelper.kt
index 6c68d6c3b5..84ca392c45 100755
--- a/vector/src/gplay/java/im/vector/app/push/fcm/FcmHelper.kt
+++ b/vector/src/gplay/java/im/vector/app/push/fcm/FcmHelper.kt
@@ -19,7 +19,6 @@ package im.vector.app.push.fcm
 
 import android.app.Activity
 import android.content.Context
-import androidx.preference.PreferenceManager
 import android.widget.Toast
 import androidx.core.content.edit
 import com.google.android.gms.common.ConnectionResult
@@ -27,6 +26,7 @@ import com.google.android.gms.common.GoogleApiAvailability
 import com.google.firebase.iid.FirebaseInstanceId
 import im.vector.app.R
 import im.vector.app.core.di.ActiveSessionHolder
+import im.vector.app.core.di.DefaultSharedPreferences
 import im.vector.app.core.pushers.PushersManager
 import im.vector.app.features.settings.VectorPreferences
 import timber.log.Timber
@@ -46,7 +46,7 @@ object FcmHelper {
      * @return the FCM token or null if not received from FCM
      */
     fun getFcmToken(context: Context): String? {
-        return PreferenceManager.getDefaultSharedPreferences(context).getString(PREFS_KEY_FCM_TOKEN, null)
+        return DefaultSharedPreferences.getInstance(context).getString(PREFS_KEY_FCM_TOKEN, null)
     }
 
     /**
@@ -58,7 +58,7 @@ object FcmHelper {
      */
     fun storeFcmToken(context: Context,
                       token: String?) {
-        PreferenceManager.getDefaultSharedPreferences(context).edit {
+        DefaultSharedPreferences.getInstance(context).edit {
             putString(PREFS_KEY_FCM_TOKEN, token)
         }
     }
diff --git a/vector/src/main/java/im/vector/app/VectorApplication.kt b/vector/src/main/java/im/vector/app/VectorApplication.kt
index f64ebf9245..c9d2c96223 100644
--- a/vector/src/main/java/im/vector/app/VectorApplication.kt
+++ b/vector/src/main/java/im/vector/app/VectorApplication.kt
@@ -21,6 +21,7 @@ import android.content.Context
 import android.content.res.Configuration
 import android.os.Handler
 import android.os.HandlerThread
+import android.os.StrictMode
 import androidx.core.provider.FontRequest
 import androidx.core.provider.FontsContractCompat
 import androidx.lifecycle.Lifecycle
@@ -92,6 +93,7 @@ class VectorApplication :
     private var fontThreadHandler: Handler? = null
 
     override fun onCreate() {
+        enableStrictModeIfNeeded()
         super.onCreate()
         appContext = this
         vectorComponent = DaggerVectorComponent.factory().create(this)
@@ -163,6 +165,15 @@ class VectorApplication :
         // initKnownEmojiHashSet(appContext)
     }
 
+    private fun enableStrictModeIfNeeded() {
+        if (BuildConfig.ENABLE_STRICT_MODE_LOGS) {
+            StrictMode.setThreadPolicy(StrictMode.ThreadPolicy.Builder()
+                    .detectAll()
+                    .penaltyLog()
+                    .build())
+        }
+    }
+
     override fun providesMatrixConfiguration() = MatrixConfiguration(BuildConfig.FLAVOR_DESCRIPTION)
 
     override fun getWorkManagerConfiguration(): WorkConfiguration {
diff --git a/vector/src/main/java/im/vector/app/core/di/DefaultSharedPreferences.kt b/vector/src/main/java/im/vector/app/core/di/DefaultSharedPreferences.kt
new file mode 100644
index 0000000000..abee0cb2e7
--- /dev/null
+++ b/vector/src/main/java/im/vector/app/core/di/DefaultSharedPreferences.kt
@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.app.core.di
+
+import android.content.Context
+import android.content.SharedPreferences
+import androidx.preference.PreferenceManager
+
+object DefaultSharedPreferences {
+
+    @Volatile private var INSTANCE: SharedPreferences? = null
+
+    fun getInstance(context: Context): SharedPreferences =
+            INSTANCE ?: synchronized(this) {
+                INSTANCE ?: PreferenceManager.getDefaultSharedPreferences(context.applicationContext).also { INSTANCE = it }
+            }
+}
diff --git a/vector/src/main/java/im/vector/app/core/glide/VectorGlideModelLoader.kt b/vector/src/main/java/im/vector/app/core/glide/VectorGlideModelLoader.kt
index 2a17c2ca1b..0eba78dbf8 100644
--- a/vector/src/main/java/im/vector/app/core/glide/VectorGlideModelLoader.kt
+++ b/vector/src/main/java/im/vector/app/core/glide/VectorGlideModelLoader.kt
@@ -100,7 +100,7 @@ class VectorGlideDataFetcher(private val activeSessionHolder: ActiveSessionHolde
 
     override fun loadData(priority: Priority, callback: DataFetcher.DataCallback<in InputStream>) {
         Timber.v("Load data: $data")
-        if (data.isLocalFile() && data.url != null) {
+        if (data.isLocalFile && data.url != null) {
             val initialFile = File(data.url)
             callback.onDataReady(initialFile.inputStream())
             return
diff --git a/vector/src/main/java/im/vector/app/core/ui/views/KeysBackupBanner.kt b/vector/src/main/java/im/vector/app/core/ui/views/KeysBackupBanner.kt
index 14d9261204..f4890780b5 100755
--- a/vector/src/main/java/im/vector/app/core/ui/views/KeysBackupBanner.kt
+++ b/vector/src/main/java/im/vector/app/core/ui/views/KeysBackupBanner.kt
@@ -23,11 +23,11 @@ import android.widget.TextView
 import androidx.constraintlayout.widget.ConstraintLayout
 import androidx.core.content.edit
 import androidx.core.view.isVisible
-import androidx.preference.PreferenceManager
 import butterknife.BindView
 import butterknife.ButterKnife
 import butterknife.OnClick
 import im.vector.app.R
+import im.vector.app.core.di.DefaultSharedPreferences
 import timber.log.Timber
 
 /**
@@ -57,7 +57,7 @@ class KeysBackupBanner @JvmOverloads constructor(
 
     init {
         setupView()
-        PreferenceManager.getDefaultSharedPreferences(context).edit {
+        DefaultSharedPreferences.getInstance(context).edit {
             putBoolean(BANNER_SETUP_DO_NOT_SHOW_AGAIN, false)
             putString(BANNER_RECOVER_DO_NOT_SHOW_FOR_VERSION, "")
         }
@@ -105,17 +105,17 @@ class KeysBackupBanner @JvmOverloads constructor(
         state.let {
             when (it) {
                 is State.Setup   -> {
-                    PreferenceManager.getDefaultSharedPreferences(context).edit {
+                    DefaultSharedPreferences.getInstance(context).edit {
                         putBoolean(BANNER_SETUP_DO_NOT_SHOW_AGAIN, true)
                     }
                 }
                 is State.Recover -> {
-                    PreferenceManager.getDefaultSharedPreferences(context).edit {
+                    DefaultSharedPreferences.getInstance(context).edit {
                         putString(BANNER_RECOVER_DO_NOT_SHOW_FOR_VERSION, it.version)
                     }
                 }
                 is State.Update  -> {
-                    PreferenceManager.getDefaultSharedPreferences(context).edit {
+                    DefaultSharedPreferences.getInstance(context).edit {
                         putString(BANNER_UPDATE_DO_NOT_SHOW_FOR_VERSION, it.version)
                     }
                 }
@@ -150,7 +150,7 @@ class KeysBackupBanner @JvmOverloads constructor(
 
     private fun renderSetup(nbOfKeys: Int) {
         if (nbOfKeys == 0
-                || PreferenceManager.getDefaultSharedPreferences(context).getBoolean(BANNER_SETUP_DO_NOT_SHOW_AGAIN, false)) {
+                || DefaultSharedPreferences.getInstance(context).getBoolean(BANNER_SETUP_DO_NOT_SHOW_AGAIN, false)) {
             // Do not display the setup banner if there is no keys to backup, or if the user has already closed it
             isVisible = false
         } else {
@@ -164,7 +164,7 @@ class KeysBackupBanner @JvmOverloads constructor(
     }
 
     private fun renderRecover(version: String) {
-        if (version == PreferenceManager.getDefaultSharedPreferences(context).getString(BANNER_RECOVER_DO_NOT_SHOW_FOR_VERSION, null)) {
+        if (version == DefaultSharedPreferences.getInstance(context).getString(BANNER_RECOVER_DO_NOT_SHOW_FOR_VERSION, null)) {
             isVisible = false
         } else {
             isVisible = true
@@ -177,7 +177,7 @@ class KeysBackupBanner @JvmOverloads constructor(
     }
 
     private fun renderUpdate(version: String) {
-        if (version == PreferenceManager.getDefaultSharedPreferences(context).getString(BANNER_UPDATE_DO_NOT_SHOW_FOR_VERSION, null)) {
+        if (version == DefaultSharedPreferences.getInstance(context).getString(BANNER_UPDATE_DO_NOT_SHOW_FOR_VERSION, null)) {
             isVisible = false
         } else {
             isVisible = true
@@ -258,7 +258,7 @@ class KeysBackupBanner @JvmOverloads constructor(
          * Inform the banner that a Recover has been done for this version, so do not show the Recover banner for this version
          */
         fun onRecoverDoneForVersion(context: Context, version: String) {
-            PreferenceManager.getDefaultSharedPreferences(context).edit {
+            DefaultSharedPreferences.getInstance(context).edit {
                 putString(BANNER_RECOVER_DO_NOT_SHOW_FOR_VERSION, version)
             }
         }
diff --git a/vector/src/main/java/im/vector/app/core/utils/RingtoneUtils.kt b/vector/src/main/java/im/vector/app/core/utils/RingtoneUtils.kt
index 82b8c3a51a..9b84ea7b2f 100644
--- a/vector/src/main/java/im/vector/app/core/utils/RingtoneUtils.kt
+++ b/vector/src/main/java/im/vector/app/core/utils/RingtoneUtils.kt
@@ -21,7 +21,7 @@ import android.media.Ringtone
 import android.media.RingtoneManager
 import android.net.Uri
 import androidx.core.content.edit
-import androidx.preference.PreferenceManager
+import im.vector.app.core.di.DefaultSharedPreferences
 import im.vector.app.features.settings.VectorPreferences
 
 /**
@@ -40,7 +40,7 @@ import im.vector.app.features.settings.VectorPreferences
  * @see Ringtone
  */
 fun getCallRingtoneUri(context: Context): Uri? {
-    val callRingtone: String? = PreferenceManager.getDefaultSharedPreferences(context)
+    val callRingtone: String? = DefaultSharedPreferences.getInstance(context)
             .getString(VectorPreferences.SETTINGS_CALL_RINGTONE_URI_PREFERENCE_KEY, null)
 
     callRingtone?.let {
@@ -94,7 +94,7 @@ fun getCallRingtoneName(context: Context): String? {
  * @see Ringtone
  */
 fun setCallRingtoneUri(context: Context, ringtoneUri: Uri) {
-    PreferenceManager.getDefaultSharedPreferences(context)
+    DefaultSharedPreferences.getInstance(context)
             .edit {
                 putString(VectorPreferences.SETTINGS_CALL_RINGTONE_URI_PREFERENCE_KEY, ringtoneUri.toString())
             }
@@ -104,14 +104,14 @@ fun setCallRingtoneUri(context: Context, ringtoneUri: Uri) {
  * Set using Riot default ringtone
  */
 fun useRiotDefaultRingtone(context: Context): Boolean {
-    return PreferenceManager.getDefaultSharedPreferences(context).getBoolean(VectorPreferences.SETTINGS_CALL_RINGTONE_USE_RIOT_PREFERENCE_KEY, true)
+    return DefaultSharedPreferences.getInstance(context).getBoolean(VectorPreferences.SETTINGS_CALL_RINGTONE_USE_RIOT_PREFERENCE_KEY, true)
 }
 
 /**
  * Ask if default Riot ringtone has to be used
  */
 fun setUseRiotDefaultRingtone(context: Context, useRiotDefault: Boolean) {
-    PreferenceManager.getDefaultSharedPreferences(context)
+    DefaultSharedPreferences.getInstance(context)
             .edit {
                 putBoolean(VectorPreferences.SETTINGS_CALL_RINGTONE_USE_RIOT_PREFERENCE_KEY, useRiotDefault)
             }
diff --git a/vector/src/main/java/im/vector/app/features/disclaimer/DisclaimerDialog.kt b/vector/src/main/java/im/vector/app/features/disclaimer/DisclaimerDialog.kt
index b9568e0b62..c2cd2e11e3 100644
--- a/vector/src/main/java/im/vector/app/features/disclaimer/DisclaimerDialog.kt
+++ b/vector/src/main/java/im/vector/app/features/disclaimer/DisclaimerDialog.kt
@@ -20,8 +20,8 @@ import android.app.Activity
 import android.content.Context
 import androidx.appcompat.app.AlertDialog
 import androidx.core.content.edit
-import androidx.preference.PreferenceManager
 import im.vector.app.R
+import im.vector.app.core.di.DefaultSharedPreferences
 import im.vector.app.core.utils.openUrlInChromeCustomTab
 import im.vector.app.features.settings.VectorSettingsUrls
 
@@ -31,7 +31,7 @@ private const val CURRENT_DISCLAIMER_VALUE = 2
 private const val SHARED_PREF_KEY = "LAST_DISCLAIMER_VERSION_VALUE"
 
 fun showDisclaimerDialog(activity: Activity) {
-    val sharedPrefs = PreferenceManager.getDefaultSharedPreferences(activity)
+    val sharedPrefs = DefaultSharedPreferences.getInstance(activity)
 
     if (sharedPrefs.getInt(SHARED_PREF_KEY, 0) < CURRENT_DISCLAIMER_VALUE) {
         sharedPrefs.edit {
@@ -52,7 +52,7 @@ fun showDisclaimerDialog(activity: Activity) {
 }
 
 fun doNotShowDisclaimerDialog(context: Context) {
-    val sharedPrefs = PreferenceManager.getDefaultSharedPreferences(context)
+    val sharedPrefs = DefaultSharedPreferences.getInstance(context)
 
     sharedPrefs.edit {
         putInt(SHARED_PREF_KEY, CURRENT_DISCLAIMER_VALUE)
diff --git a/vector/src/main/java/im/vector/app/features/home/room/detail/RoomDetailViewModel.kt b/vector/src/main/java/im/vector/app/features/home/room/detail/RoomDetailViewModel.kt
index eab0007080..a77d50d767 100644
--- a/vector/src/main/java/im/vector/app/features/home/room/detail/RoomDetailViewModel.kt
+++ b/vector/src/main/java/im/vector/app/features/home/room/detail/RoomDetailViewModel.kt
@@ -896,13 +896,15 @@ class RoomDetailViewModel @AssistedInject constructor(
     }
 
     private fun handleEventVisible(action: RoomDetailAction.TimelineEventTurnsVisible) {
-        if (action.event.root.sendState.isSent()) { // ignore pending/local events
-            visibleEventsObservable.accept(action)
-        }
-        // We need to update this with the related m.replace also (to move read receipt)
-        action.event.annotations?.editSummary?.sourceEvents?.forEach {
-            room.getTimeLineEvent(it)?.let { event ->
-                visibleEventsObservable.accept(RoomDetailAction.TimelineEventTurnsVisible(event))
+        viewModelScope.launch(Dispatchers.Default) {
+            if (action.event.root.sendState.isSent()) { // ignore pending/local events
+                visibleEventsObservable.accept(action)
+            }
+            // We need to update this with the related m.replace also (to move read receipt)
+            action.event.annotations?.editSummary?.sourceEvents?.forEach {
+                room.getTimeLineEvent(it)?.let { event ->
+                    visibleEventsObservable.accept(RoomDetailAction.TimelineEventTurnsVisible(event))
+                }
             }
         }
     }
diff --git a/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/item/MessageImageVideoItem.kt b/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/item/MessageImageVideoItem.kt
index 9ada087207..ffc51f671f 100644
--- a/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/item/MessageImageVideoItem.kt
+++ b/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/item/MessageImageVideoItem.kt
@@ -50,7 +50,7 @@ abstract class MessageImageVideoItem : AbsMessageItem<MessageImageVideoItem.Hold
         super.bind(holder)
         imageContentRenderer.render(mediaData, mode, holder.imageView)
         if (!attributes.informationData.sendState.hasFailed()) {
-            contentUploadStateTrackerBinder.bind(attributes.informationData.eventId, mediaData.isLocalFile(), holder.progressLayout)
+            contentUploadStateTrackerBinder.bind(attributes.informationData.eventId, mediaData.isLocalFile, holder.progressLayout)
         } else {
             holder.progressLayout.isVisible = false
         }
diff --git a/vector/src/main/java/im/vector/app/features/homeserver/ServerUrlsRepository.kt b/vector/src/main/java/im/vector/app/features/homeserver/ServerUrlsRepository.kt
index 683dea43b0..094fc4b3bb 100644
--- a/vector/src/main/java/im/vector/app/features/homeserver/ServerUrlsRepository.kt
+++ b/vector/src/main/java/im/vector/app/features/homeserver/ServerUrlsRepository.kt
@@ -18,8 +18,8 @@ package im.vector.app.features.homeserver
 
 import android.content.Context
 import androidx.core.content.edit
-import androidx.preference.PreferenceManager
 import im.vector.app.R
+import im.vector.app.core.di.DefaultSharedPreferences
 
 /**
  * Object to store and retrieve home and identity server urls
@@ -38,7 +38,7 @@ object ServerUrlsRepository {
      * Save home and identity sever urls received by the Referrer receiver
      */
     fun setDefaultUrlsFromReferrer(context: Context, homeServerUrl: String, identityServerUrl: String) {
-        PreferenceManager.getDefaultSharedPreferences(context)
+        DefaultSharedPreferences.getInstance(context)
                 .edit {
                     if (homeServerUrl.isNotEmpty()) {
                         putString(DEFAULT_REFERRER_HOME_SERVER_URL_PREF, homeServerUrl)
@@ -54,7 +54,7 @@ object ServerUrlsRepository {
      * Save home and identity sever urls entered by the user. May be custom or default value
      */
     fun saveServerUrls(context: Context, homeServerUrl: String, identityServerUrl: String) {
-        PreferenceManager.getDefaultSharedPreferences(context)
+        DefaultSharedPreferences.getInstance(context)
                 .edit {
                     putString(HOME_SERVER_URL_PREF, homeServerUrl)
                     putString(IDENTITY_SERVER_URL_PREF, identityServerUrl)
@@ -65,7 +65,7 @@ object ServerUrlsRepository {
      * Return last used home server url, or the default one from referrer or the default one from resources
      */
     fun getLastHomeServerUrl(context: Context): String {
-        val prefs = PreferenceManager.getDefaultSharedPreferences(context)
+        val prefs = DefaultSharedPreferences.getInstance(context)
 
         return prefs.getString(HOME_SERVER_URL_PREF,
                 prefs.getString(DEFAULT_REFERRER_HOME_SERVER_URL_PREF,
diff --git a/vector/src/main/java/im/vector/app/features/media/ImageContentRenderer.kt b/vector/src/main/java/im/vector/app/features/media/ImageContentRenderer.kt
index 5c43b25d51..cf1381a1cf 100644
--- a/vector/src/main/java/im/vector/app/features/media/ImageContentRenderer.kt
+++ b/vector/src/main/java/im/vector/app/features/media/ImageContentRenderer.kt
@@ -36,9 +36,9 @@ import im.vector.app.core.glide.GlideRequest
 import im.vector.app.core.ui.model.Size
 import im.vector.app.core.utils.DimensionConverter
 import im.vector.app.core.utils.isLocalFile
+import kotlinx.android.parcel.Parcelize
 import org.matrix.android.sdk.api.session.content.ContentUrlResolver
 import org.matrix.android.sdk.internal.crypto.attachments.ElementToDecrypt
-import kotlinx.android.parcel.Parcelize
 import org.matrix.android.sdk.api.extensions.tryThis
 import timber.log.Timber
 import java.io.File
@@ -69,12 +69,10 @@ class ImageContentRenderer @Inject constructor(private val activeSessionHolder:
             val maxHeight: Int,
             val width: Int?,
             val maxWidth: Int,
+            val isLocalFile: Boolean = url.isLocalFile(),
             // If true will load non mxc url, be careful to set it only for images sent by you
             override val allowNonMxcUrls: Boolean = false
-    ) : AttachmentData {
-
-        fun isLocalFile() = url.isLocalFile()
-    }
+    ) : AttachmentData
 
     enum class Mode {
         FULL_SIZE,
@@ -268,7 +266,7 @@ class ImageContentRenderer @Inject constructor(private val activeSessionHolder:
 
     private fun resolveUrl(data: Data) =
             (activeSessionHolder.getActiveSession().contentUrlResolver().resolveFullSize(data.url)
-                    ?: data.url?.takeIf { data.isLocalFile() && data.allowNonMxcUrls })
+                    ?: data.url?.takeIf { data.isLocalFile && data.allowNonMxcUrls })
 
     private fun processSize(data: Data, mode: Mode): Size {
         val maxImageWidth = data.maxWidth
diff --git a/vector/src/main/java/im/vector/app/features/rageshake/VectorFileLogger.kt b/vector/src/main/java/im/vector/app/features/rageshake/VectorFileLogger.kt
index 6f38ae0102..f26ffdd700 100644
--- a/vector/src/main/java/im/vector/app/features/rageshake/VectorFileLogger.kt
+++ b/vector/src/main/java/im/vector/app/features/rageshake/VectorFileLogger.kt
@@ -19,6 +19,9 @@ package im.vector.app.features.rageshake
 import android.content.Context
 import android.util.Log
 import im.vector.app.features.settings.VectorPreferences
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.launch
 import timber.log.Timber
 import java.io.File
 import java.io.PrintWriter
@@ -85,12 +88,14 @@ class VectorFileLogger @Inject constructor(val context: Context, private val vec
     }
 
     override fun log(priority: Int, tag: String?, message: String, t: Throwable?) {
-        if (sFileHandler == null) return
-        if (skipLog(priority)) return
-        if (t != null) {
-            logToFile(t)
+        GlobalScope.launch(Dispatchers.IO) {
+            if (sFileHandler == null) return@launch
+            if (skipLog(priority)) return@launch
+            if (t != null) {
+                logToFile(t)
+            }
+            logToFile(prioPrefixes[priority] ?: "$priority ", tag ?: "Tag", message)
         }
-        logToFile(prioPrefixes[priority] ?: "$priority ", tag ?: "Tag", message)
     }
 
     private fun skipLog(priority: Int): Boolean {
@@ -174,7 +179,8 @@ class VectorFileLogger @Inject constructor(val context: Context, private val vec
 
         companion object {
             private val LINE_SEPARATOR = System.getProperty("line.separator") ?: "\n"
-//            private val DATE_FORMAT = SimpleDateFormat("MM-dd HH:mm:ss.SSS", Locale.US)
+
+            //            private val DATE_FORMAT = SimpleDateFormat("MM-dd HH:mm:ss.SSS", Locale.US)
             private val DATE_FORMAT = SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss*SSSZZZZ", Locale.US)
 
             private var mIsTimeZoneSet = false
@@ -201,7 +207,6 @@ class VectorFileLogger @Inject constructor(val context: Context, private val vec
         if (null == sCacheDirectory) {
             return
         }
-
         val b = StringBuilder()
         b.append(Thread.currentThread().id)
         b.append(" ")
diff --git a/vector/src/main/java/im/vector/app/features/rageshake/VectorUncaughtExceptionHandler.kt b/vector/src/main/java/im/vector/app/features/rageshake/VectorUncaughtExceptionHandler.kt
index 53f10e5d54..6954b9c87b 100644
--- a/vector/src/main/java/im/vector/app/features/rageshake/VectorUncaughtExceptionHandler.kt
+++ b/vector/src/main/java/im/vector/app/features/rageshake/VectorUncaughtExceptionHandler.kt
@@ -19,7 +19,7 @@ package im.vector.app.features.rageshake
 import android.content.Context
 import android.os.Build
 import androidx.core.content.edit
-import androidx.preference.PreferenceManager
+import im.vector.app.core.di.DefaultSharedPreferences
 import im.vector.app.core.resources.VersionCodeProvider
 import im.vector.app.features.version.VersionProvider
 import org.matrix.android.sdk.api.Matrix
@@ -61,7 +61,7 @@ class VectorUncaughtExceptionHandler @Inject constructor(private val bugReporter
      */
     override fun uncaughtException(thread: Thread, throwable: Throwable) {
         Timber.v("Uncaught exception: $throwable")
-        PreferenceManager.getDefaultSharedPreferences(context).edit {
+        DefaultSharedPreferences.getInstance(context).edit {
             putBoolean(PREFS_CRASH_KEY, true)
         }
         val b = StringBuilder()
@@ -115,7 +115,7 @@ class VectorUncaughtExceptionHandler @Inject constructor(private val bugReporter
      * @return true if the application crashed
      */
     fun didAppCrash(context: Context): Boolean {
-        return PreferenceManager.getDefaultSharedPreferences(context)
+        return DefaultSharedPreferences.getInstance(context)
                 .getBoolean(PREFS_CRASH_KEY, false)
     }
 
@@ -123,7 +123,7 @@ class VectorUncaughtExceptionHandler @Inject constructor(private val bugReporter
      * Clear the crash status
      */
     fun clearAppCrashStatus(context: Context) {
-        PreferenceManager.getDefaultSharedPreferences(context).edit {
+        DefaultSharedPreferences.getInstance(context).edit {
             remove(PREFS_CRASH_KEY)
         }
     }
diff --git a/vector/src/main/java/im/vector/app/features/roomprofile/members/RoomMemberListViewModel.kt b/vector/src/main/java/im/vector/app/features/roomprofile/members/RoomMemberListViewModel.kt
index 5ce4b60445..fedf1729ad 100644
--- a/vector/src/main/java/im/vector/app/features/roomprofile/members/RoomMemberListViewModel.kt
+++ b/vector/src/main/java/im/vector/app/features/roomprofile/members/RoomMemberListViewModel.kt
@@ -22,6 +22,14 @@ import com.airbnb.mvrx.MvRxViewModelFactory
 import com.airbnb.mvrx.ViewModelContext
 import com.squareup.inject.assisted.Assisted
 import com.squareup.inject.assisted.AssistedInject
+import im.vector.app.core.extensions.exhaustive
+import im.vector.app.core.platform.EmptyViewEvents
+import im.vector.app.core.platform.VectorViewModel
+import im.vector.app.features.powerlevel.PowerLevelsObservableFactory
+import io.reactivex.Observable
+import io.reactivex.android.schedulers.AndroidSchedulers
+import io.reactivex.functions.BiFunction
+import kotlinx.coroutines.launch
 import org.matrix.android.sdk.api.NoOpMatrixCallback
 import org.matrix.android.sdk.api.crypto.RoomEncryptionTrustLevel
 import org.matrix.android.sdk.api.extensions.orFalse
@@ -39,14 +47,6 @@ import org.matrix.android.sdk.rx.asObservable
 import org.matrix.android.sdk.rx.mapOptional
 import org.matrix.android.sdk.rx.rx
 import org.matrix.android.sdk.rx.unwrap
-import im.vector.app.core.extensions.exhaustive
-import im.vector.app.core.platform.EmptyViewEvents
-import im.vector.app.core.platform.VectorViewModel
-import im.vector.app.features.powerlevel.PowerLevelsObservableFactory
-import io.reactivex.Observable
-import io.reactivex.android.schedulers.AndroidSchedulers
-import io.reactivex.functions.BiFunction
-import kotlinx.coroutines.launch
 import timber.log.Timber
 
 class RoomMemberListViewModel @AssistedInject constructor(@Assisted initialState: RoomMemberListViewState,
diff --git a/vector/src/main/java/im/vector/app/features/settings/FontScale.kt b/vector/src/main/java/im/vector/app/features/settings/FontScale.kt
index 5fbb021e0a..ad678ec49d 100644
--- a/vector/src/main/java/im/vector/app/features/settings/FontScale.kt
+++ b/vector/src/main/java/im/vector/app/features/settings/FontScale.kt
@@ -19,8 +19,8 @@ package im.vector.app.features.settings
 import android.content.Context
 import androidx.annotation.StringRes
 import androidx.core.content.edit
-import androidx.preference.PreferenceManager
 import im.vector.app.R
+import im.vector.app.core.di.DefaultSharedPreferences
 
 /**
  * Object to manage the Font Scale choice of the user
@@ -56,7 +56,7 @@ object FontScale {
      * @return the font scale value
      */
     fun getFontScaleValue(context: Context): FontScaleValue {
-        val preferences = PreferenceManager.getDefaultSharedPreferences(context)
+        val preferences = DefaultSharedPreferences.getInstance(context)
 
         return if (APPLICATION_FONT_SCALE_KEY !in preferences) {
             val fontScale = context.resources.configuration.fontScale
@@ -81,7 +81,7 @@ object FontScale {
      * @param fontScaleValue the font scale value to store
      */
     private fun saveFontScaleValue(context: Context, fontScaleValue: FontScaleValue) {
-        PreferenceManager.getDefaultSharedPreferences(context)
+        DefaultSharedPreferences.getInstance(context)
                 .edit { putString(APPLICATION_FONT_SCALE_KEY, fontScaleValue.preferenceValue) }
     }
 }
diff --git a/vector/src/main/java/im/vector/app/features/settings/VectorLocale.kt b/vector/src/main/java/im/vector/app/features/settings/VectorLocale.kt
index b9d81ab005..cff4ca0cb9 100644
--- a/vector/src/main/java/im/vector/app/features/settings/VectorLocale.kt
+++ b/vector/src/main/java/im/vector/app/features/settings/VectorLocale.kt
@@ -19,9 +19,9 @@ package im.vector.app.features.settings
 import android.content.Context
 import android.content.res.Configuration
 import androidx.core.content.edit
-import androidx.preference.PreferenceManager
 import im.vector.app.BuildConfig
 import im.vector.app.R
+import im.vector.app.core.di.DefaultSharedPreferences
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 import timber.log.Timber
@@ -59,7 +59,7 @@ object VectorLocale {
      */
     fun init(context: Context) {
         this.context = context
-        val preferences = PreferenceManager.getDefaultSharedPreferences(context)
+        val preferences = DefaultSharedPreferences.getInstance(context)
 
         if (preferences.contains(APPLICATION_LOCALE_LANGUAGE_KEY)) {
             applicationLocale = Locale(preferences.getString(APPLICATION_LOCALE_LANGUAGE_KEY, "")!!,
@@ -85,7 +85,7 @@ object VectorLocale {
     fun saveApplicationLocale(locale: Locale) {
         applicationLocale = locale
 
-        PreferenceManager.getDefaultSharedPreferences(context).edit {
+        DefaultSharedPreferences.getInstance(context).edit {
             val language = locale.language
             if (language.isEmpty()) {
                 remove(APPLICATION_LOCALE_LANGUAGE_KEY)
diff --git a/vector/src/main/java/im/vector/app/features/settings/VectorPreferences.kt b/vector/src/main/java/im/vector/app/features/settings/VectorPreferences.kt
index 69f8540a1d..886395c1f7 100755
--- a/vector/src/main/java/im/vector/app/features/settings/VectorPreferences.kt
+++ b/vector/src/main/java/im/vector/app/features/settings/VectorPreferences.kt
@@ -22,10 +22,10 @@ import android.media.RingtoneManager
 import android.net.Uri
 import android.provider.MediaStore
 import androidx.core.content.edit
-import androidx.preference.PreferenceManager
 import com.squareup.seismic.ShakeDetector
 import im.vector.app.BuildConfig
 import im.vector.app.R
+import im.vector.app.core.di.DefaultSharedPreferences
 import im.vector.app.features.homeserver.ServerUrlsRepository
 import im.vector.app.features.themes.ThemeUtils
 import org.matrix.android.sdk.api.extensions.tryThis
@@ -227,7 +227,7 @@ class VectorPreferences @Inject constructor(private val context: Context) {
         )
     }
 
-    private val defaultPrefs = PreferenceManager.getDefaultSharedPreferences(context)
+    private val defaultPrefs = DefaultSharedPreferences.getInstance(context)
 
     /**
      * Clear the preferences.
diff --git a/vector/src/main/java/im/vector/app/features/themes/ThemeUtils.kt b/vector/src/main/java/im/vector/app/features/themes/ThemeUtils.kt
index d337b790a3..18faa07954 100644
--- a/vector/src/main/java/im/vector/app/features/themes/ThemeUtils.kt
+++ b/vector/src/main/java/im/vector/app/features/themes/ThemeUtils.kt
@@ -25,9 +25,10 @@ import androidx.annotation.AttrRes
 import androidx.annotation.ColorInt
 import androidx.core.content.ContextCompat
 import androidx.core.graphics.drawable.DrawableCompat
-import androidx.preference.PreferenceManager
 import im.vector.app.R
+import im.vector.app.core.di.DefaultSharedPreferences
 import timber.log.Timber
+import java.util.concurrent.atomic.AtomicReference
 
 /**
  * Util class for managing themes.
@@ -42,6 +43,8 @@ object ThemeUtils {
     private const val THEME_BLACK_VALUE = "black"
     private const val THEME_STATUS_VALUE = "status"
 
+    private var currentTheme = AtomicReference<String>(null)
+
     private val mColorByAttr = HashMap<Int, Int>()
 
     // init the theme
@@ -68,8 +71,15 @@ object ThemeUtils {
      * @return the selected application theme
      */
     fun getApplicationTheme(context: Context): String {
-        return PreferenceManager.getDefaultSharedPreferences(context)
-                .getString(APPLICATION_THEME_KEY, THEME_LIGHT_VALUE) ?: THEME_LIGHT_VALUE
+        val currentTheme = this.currentTheme.get()
+        return if (currentTheme == null) {
+            val themeFromPref = DefaultSharedPreferences.getInstance(context)
+                    .getString(APPLICATION_THEME_KEY, THEME_LIGHT_VALUE) ?: THEME_LIGHT_VALUE
+            this.currentTheme.set(themeFromPref)
+            themeFromPref
+        } else {
+            currentTheme
+        }
     }
 
     /**
@@ -78,6 +88,7 @@ object ThemeUtils {
      * @param aTheme the new theme
      */
     fun setApplicationTheme(context: Context, aTheme: String) {
+        currentTheme.set(aTheme)
         when (aTheme) {
             THEME_DARK_VALUE   -> context.setTheme(R.style.AppTheme_Dark)
             THEME_BLACK_VALUE  -> context.setTheme(R.style.AppTheme_Black)