diff --git a/Classes/ChatsListTableView.m b/Classes/ChatsListTableView.m
index 04a5f5aab..2d5ad4a1d 100644
--- a/Classes/ChatsListTableView.m
+++ b/Classes/ChatsListTableView.m
@@ -129,6 +129,8 @@ static int sorted_history_comparison(LinphoneChatRoom *to_insert, LinphoneChatRo
 }
 
 + (void) saveDataToUserDefaults {
+	// As extensions is disabled by default, this function takes too much CPU.
+#if 0
     NSUserDefaults *defaults = [[NSUserDefaults alloc] initWithSuiteName:@"group.belledonne-communications.linphone.widget"];
     MSList *sorted = nil;
     const MSList *unsorted = linphone_core_get_chat_rooms(LC);
@@ -192,6 +194,7 @@ static int sorted_history_comparison(LinphoneChatRoom *to_insert, LinphoneChatRo
 	}
 	
     [defaults setObject:addresses forKey:@"chatrooms"];
+#endif
 }
 
 - (void)markCellAsRead:(LinphoneChatRoom *)chatRoom {
diff --git a/Classes/HistoryListTableView.m b/Classes/HistoryListTableView.m
index b6e93aef7..658d70361 100644
--- a/Classes/HistoryListTableView.m
+++ b/Classes/HistoryListTableView.m
@@ -168,6 +168,8 @@
 }
 
 + (void) saveDataToUserDefaults {
+	// As extensions is disabled by default, this function takes too much CPU.
+#if 0
     const bctbx_list_t *logs = linphone_core_get_call_logs(LC);
     NSUserDefaults *mySharedDefaults = [[NSUserDefaults alloc] initWithSuiteName: @"group.belledonne-communications.linphone.widget"];
     NSMutableArray *logsShare = [NSMutableArray array];
@@ -223,6 +225,7 @@
     }
     
     [mySharedDefaults setObject:logsShare forKey:@"logs"];
+#endif
 }
 
 - (void)computeSections {