diff --git a/frontend/src/features/triage/TasksView.tsx b/frontend/src/features/triage/TasksView.tsx
index 950e950..30c9567 100644
--- a/frontend/src/features/triage/TasksView.tsx
+++ b/frontend/src/features/triage/TasksView.tsx
@@ -173,7 +173,7 @@ export const TasksView: React.FC<TasksViewProps> = ({
   const [filter, setFilter] = useState<'open' | 'done' | 'discarded'>('open');
   const [tasks, setTasks] = useState<Thought[]>([]);
   const [taskLists, setTaskLists] = useState<TaskList[]>([]);
-  const [selectedListId, setSelectedListId] = useState<string>(
+  const [selectedListId, setSelectedListIdState] = useState<string>(
     () => remembered.listId || 'all'
   );
   const viewMode: ViewMode = viewModes[selectedListId] || 'list';
@@ -304,6 +304,10 @@ export const TasksView: React.FC<TasksViewProps> = ({
       ]);
       if (seq !== loadSeqRef.current) return; // a newer reload is under way
       loadedListRef.current = listId;
+      listCacheRef.current.set(listId, {
+        tasks: Array.isArray(allTasks) ? allTasks : [],
+        trash: Array.isArray(trash) ? trash : [],
+      });
       setTasks(Array.isArray(allTasks) ? allTasks : []);
       setTaskLists(Array.isArray(allLists) ? allLists : []);
       // The remembered list was deleted or unshared meanwhile
@@ -327,6 +331,33 @@ export const TasksView: React.FC<TasksViewProps> = ({
   const selectedListIdRef = useRef(selectedListId);
   selectedListIdRef.current = selectedListId;
 
+  // Last known tasks of every list opened in this session. Switching lists shows them in the same render
+  // as the new list's view (list or Kanban), so the board never flashes the previous list's tasks; the
+  // reload then brings them up to date. A list not opened yet takes its share of "Alle Aufgaben".
+  const listCacheRef = useRef(new Map<string, { tasks: Thought[]; trash: TrashedTask[] }>());
+  useEffect(() => {
+    if (!loading && loadedListRef.current === selectedListId) {
+      listCacheRef.current.set(selectedListId, { tasks, trash: taskTrash });
+    }
+  }, [tasks, taskTrash, loading, selectedListId]);
+  const setSelectedListId = useCallback((id: string) => {
+    if (id === selectedListIdRef.current) return;
+    const cache = listCacheRef.current;
+    let known = cache.get(id);
+    const all = cache.get('all');
+    if (!known && id !== 'all' && all) {
+      known = {
+        tasks: all.tasks.filter((t) => t.taskListId === id),
+        trash: all.trash.filter((t) => t.taskListId === id),
+      };
+    }
+    setTasks(known ? known.tasks : []);
+    setTaskTrash(known ? known.trash : []);
+    setLoading(!known);
+    loadedListRef.current = known ? id : null;
+    setSelectedListIdState(id);
+  }, []);
+
   const onRefreshStatsRef = useRef(onRefreshStats);
   onRefreshStatsRef.current = onRefreshStats;
   // The realtime handler is registered once; it must reload with the current list, not the first one
@@ -1371,7 +1402,9 @@ export const TasksView: React.FC<TasksViewProps> = ({
     try {
       await api.deleteTaskList(listId);
       setTaskLists((prev) => prev.filter((l) => l.id !== listId));
-      setSelectedListId('all');
+      // Plain switch: the deleted list's tasks belong to "Alle Aufgaben" anyway (and the menu effect keeps
+      // this handler out of its dependencies)
+      setSelectedListIdState('all');
     } catch (err: any) {
       alert(err.message);
     }
@@ -1568,6 +1601,7 @@ export const TasksView: React.FC<TasksViewProps> = ({
     groupBy,
     defaultGroupBy,
     setViewMode,
+    setSelectedListId,
     sortBy,
     openTasks.length,
     doneTasks.length,