diff --git a/mobile/lib/features/channels/channel_detail_page.dart b/mobile/lib/features/channels/channel_detail_page.dart
index 745b0f3950..162f1fd804 100644
--- a/mobile/lib/features/channels/channel_detail_page.dart
+++ b/mobile/lib/features/channels/channel_detail_page.dart
@@ -675,12 +675,16 @@ class _ResolvedChannelDetailPage extends HookConsumerWidget {
         ? dmHeader?.presenceLabel
         : headerMemberLabel;
 
-    final timelineMessages = resolvedChannel.isForum
-        ? <TimelineMessage>[]
-        : formatTimeline(
-            messagesState.value ?? const [],
-            currentPubkey: currentPubkey,
-          );
+    // The page also rebuilds for read state, presence, roster and layout
+    // changes. Format only when the events themselves change: the notifier
+    // publishes a new list for every event change.
+    final events = messagesState.value ?? const <NostrEvent>[];
+    final timelineMessages = useMemoized(
+      () => resolvedChannel.isForum
+          ? <TimelineMessage>[]
+          : formatTimeline(events, currentPubkey: currentPubkey),
+      [events, currentPubkey, resolvedChannel.isForum],
+    );
     final timelineEntries = buildMainTimelineEntries(
       // End events still update the original card through allMessages.
       timelineMessages
diff --git a/mobile/test/features/channels/channel_detail_page_test/loading_review_tests.dart b/mobile/test/features/channels/channel_detail_page_test/loading_review_tests.dart
index 1c71be9ee6..e69e4005e7 100644
--- a/mobile/test/features/channels/channel_detail_page_test/loading_review_tests.dart
+++ b/mobile/test/features/channels/channel_detail_page_test/loading_review_tests.dart
@@ -446,24 +446,43 @@ void _loadingReviewTests() {
     );
   }
 
-  testWidgets('loaded page rebuild formats the timeline once', (tester) async {
+  testWidgets('loaded page formats the timeline only when its events change', (
+    tester,
+  ) async {
     var transforms = 0;
     debugOnFormatTimeline = () => transforms++;
     addTearDown(() => debugOnFormatTimeline = null);
+    final first = _textMsg(
+      id: 'one',
+      pubkey: 'alice',
+      content: 'Loaded message',
+    );
+    final messages = _FakeMessagesNotifier([first]);
     await tester.pumpWidget(
-      _buildTestable(
-        messages: [
-          _textMsg(id: 'one', pubkey: 'alice', content: 'Loaded message'),
-        ],
-      ),
+      _buildTestable(messages: [first], messagesNotifier: messages),
     );
     await tester.pumpAndSettle();
+    // Read state, presence and layout changes rebuild the page; formatting
+    // every event again for each of them stalls large channels.
     for (var i = 0; i < 3; i++) {
       transforms = 0;
       tester.element(find.byType(ChannelDetailPage)).markNeedsBuild();
       await tester.pump();
-      expect(transforms, 1);
+      expect(transforms, 0);
     }
+    transforms = 0;
+    messages.setMessages([
+      first,
+      _textMsg(
+        id: 'two',
+        pubkey: 'alice',
+        createdAt: first.createdAt + 1,
+        content: 'Live message',
+      ),
+    ]);
+    await tester.pump();
+    expect(transforms, 1);
+    expect(find.text('Live message', findRichText: true), findsOneWidget);
   });
 
   testWidgets('reconnect keeps cached media in place', (tester) async {