diff --git a/src/ClaudeDo.Ui/Services/OperationTiming.cs b/src/ClaudeDo.Ui/Services/OperationTiming.cs
new file mode 100644
index 00000000..5cd0a95b
--- /dev/null
+++ b/src/ClaudeDo.Ui/Services/OperationTiming.cs
@@ -0,0 +1,49 @@
+using System.Text.Json;
+using ClaudeDo.Data;
+
+namespace ClaudeDo.Ui.Services;
+
+/// <summary>
+/// Appends one NDJSON line per timed operation (hub invoke, bulk DB read/write) to a log file, so
+/// a day of normal usage yields a file that can be sorted by duration to find real outliers.
+/// Never throws — a failed write is swallowed, because a measurement must never disturb the app.
+/// </summary>
+public sealed class OperationTiming
+{
+    public static string DefaultPath =>
+        Path.Combine(Paths.AppDataRoot(), "logs", "operation-timing.ndjson");
+
+    public static OperationTiming Shared { get; } = new(DefaultPath);
+
+    private readonly string _path;
+    private readonly object _writeLock = new();
+
+    public OperationTiming(string filePath) => _path = filePath;
+
+    public void Record(string kind, string operation, TimeSpan elapsed, bool ok)
+    {
+        try
+        {
+            var line = JsonSerializer.Serialize(new
+            {
+                ts = DateTime.UtcNow,
+                kind,
+                op = operation,
+                ms = (long)elapsed.TotalMilliseconds,
+                ok,
+            });
+
+            lock (_writeLock)
+            {
+                var dir = Path.GetDirectoryName(_path);
+                if (!string.IsNullOrEmpty(dir))
+                    Directory.CreateDirectory(dir);
+                File.AppendAllText(_path, line + Environment.NewLine);
+            }
+        }
+        catch
+        {
+            // A measurement must never disturb the app.
+        }
+    }
+}
diff --git a/src/ClaudeDo.Ui/Services/WorkerClient.cs b/src/ClaudeDo.Ui/Services/WorkerClient.cs
index e512b5dc..cf7206b4 100644
--- a/src/ClaudeDo.Ui/Services/WorkerClient.cs
+++ b/src/ClaudeDo.Ui/Services/WorkerClient.cs
@@ -277,23 +277,58 @@ public partial class WorkerClient : ObservableObject, IAsyncDisposable, IWorkerC
     /// <summary>Invoke a hub method, returning default (null) when the worker is offline or errors.</summary>
     private async Task<T?> TryInvokeAsync<T>(string method, params object?[] args)
     {
-        try { return await _hub.InvokeCoreAsync<T>(method, args); }
+        var sw = System.Diagnostics.Stopwatch.StartNew();
+        var ok = false;
+        try
+        {
+            var result = await _hub.InvokeCoreAsync<T>(method, args);
+            ok = true;
+            return result;
+        }
         catch { return default; }
+        finally { OperationTiming.Shared.Record("hub", method, sw.Elapsed, ok); }
+    }
+
+    /// <summary>Times a void hub invoke without changing its exception/cancellation behavior.</summary>
+    private async Task InvokeTimedAsync(string method, Func<Task> invoke)
+    {
+        var sw = System.Diagnostics.Stopwatch.StartNew();
+        var ok = false;
+        try
+        {
+            await invoke();
+            ok = true;
+        }
+        finally { OperationTiming.Shared.Record("hub", method, sw.Elapsed, ok); }
+    }
+
+    /// <summary>Times a hub invoke that returns a value, without changing its exception/cancellation behavior.</summary>
+    private async Task<T> InvokeTimedAsync<T>(string method, Func<Task<T>> invoke)
+    {
+        var sw = System.Diagnostics.Stopwatch.StartNew();
+        var ok = false;
+        try
+        {
+            var result = await invoke();
+            ok = true;
+            return result;
+        }
+        finally { OperationTiming.Shared.Record("hub", method, sw.Elapsed, ok); }
     }
 
     public async Task RunNowAsync(string taskId)
     {
-        await _hub.InvokeAsync("RunNow", taskId);
+        await InvokeTimedAsync("RunNow", () => _hub.InvokeAsync("RunNow", taskId));
     }
 
     public async Task ContinueTaskAsync(string taskId, string followUpPrompt)
     {
-        await _hub.InvokeAsync("ContinueTask", taskId, followUpPrompt);
+        await InvokeTimedAsync("ContinueTask", () => _hub.InvokeAsync("ContinueTask", taskId, followUpPrompt));
     }
 
     public async Task AnswerTaskQuestionAsync(string taskId, string questionId, string answer)
     {
-        try { await _hub.InvokeAsync<bool>("AnswerTaskQuestion", taskId, questionId, answer); }
+        try { await InvokeTimedAsync<bool>("AnswerTaskQuestion", () => _hub.InvokeAsync<bool>("AnswerTaskQuestion", taskId, questionId, answer)); }
         catch { /* offline or already resolved — the UI clears optimistically */ }
     }
 
@@ -302,43 +337,43 @@ public partial class WorkerClient : ObservableObject, IAsyncDisposable, IWorkerC
 
     public async Task ResetTaskAsync(string taskId)
     {
-        await _hub.InvokeAsync("ResetTask", taskId);
+        await InvokeTimedAsync("ResetTask", () => _hub.InvokeAsync("ResetTask", taskId));
     }
 
     public async Task<MergeResultDto> MergeTaskAsync(string taskId, string targetBranch, bool removeWorktree, string commitMessage)
     {
-        return await _hub.InvokeAsync<MergeResultDto>(
-            "MergeTask", taskId, targetBranch, removeWorktree, commitMessage);
+        return await InvokeTimedAsync<MergeResultDto>("MergeTask", () => _hub.InvokeAsync<MergeResultDto>(
+            "MergeTask", taskId, targetBranch, removeWorktree, commitMessage));
     }
 
     public Task<MergeResultDto> StartConflictMergeAsync(string taskId, string targetBranch)
-        => _hub.InvokeAsync<MergeResultDto>("StartConflictMerge", taskId, targetBranch);
+        => InvokeTimedAsync<MergeResultDto>("StartConflictMerge", () => _hub.InvokeAsync<MergeResultDto>("StartConflictMerge", taskId, targetBranch));
 
     public Task<MergeConflictDocumentsDto> GetMergeConflictDocumentsAsync(string taskId)
-        => _hub.InvokeAsync<MergeConflictDocumentsDto>("GetMergeConflictDocuments", taskId);
+        => InvokeTimedAsync<MergeConflictDocumentsDto>("GetMergeConflictDocuments", () => _hub.InvokeAsync<MergeConflictDocumentsDto>("GetMergeConflictDocuments", taskId));
 
     public Task WriteConflictResolutionAsync(string taskId, string path, string resolvedContent)
-        => _hub.InvokeAsync("WriteConflictResolution", taskId, path, resolvedContent);
+        => InvokeTimedAsync("WriteConflictResolution", () => _hub.InvokeAsync("WriteConflictResolution", taskId, path, resolvedContent));
 
     public Task<MergeResultDto> ContinueConflictMergeAsync(string taskId)
-        => _hub.InvokeAsync<MergeResultDto>("ContinueConflictMerge", taskId);
+        => InvokeTimedAsync<MergeResultDto>("ContinueConflictMerge", () => _hub.InvokeAsync<MergeResultDto>("ContinueConflictMerge", taskId));
 
     public Task AbortConflictMergeAsync(string taskId)
-        => _hub.InvokeAsync("AbortConflictMerge", taskId);
+        => InvokeTimedAsync("AbortConflictMerge", () => _hub.InvokeAsync("AbortConflictMerge", taskId));
 
     public Task<MergeTargetsDto?> GetMergeTargetsAsync(string taskId)
         => TryInvokeAsync<MergeTargetsDto>("GetMergeTargets", taskId);
 
     public async Task CancelTaskAsync(string taskId)
     {
-        await _hub.InvokeAsync("CancelTask", taskId);
+        await InvokeTimedAsync("CancelTask", () => _hub.InvokeAsync("CancelTask", taskId));
     }
 
     public async Task<(bool Ok, string? Error)> DeleteTaskAsync(string taskId)
     {
         try
         {
-            await _hub.InvokeAsync("DeleteTask", taskId, CancellationToken.None);
+            await InvokeTimedAsync("DeleteTask", () => _hub.InvokeAsync("DeleteTask", taskId, CancellationToken.None));
             return (true, null);
         }
         catch (HubException ex)
@@ -354,7 +389,7 @@ public partial class WorkerClient : ObservableObject, IAsyncDisposable, IWorkerC
 
     public async Task WakeQueueAsync()
     {
-        await _hub.InvokeAsync("WakeQueue");
+        await InvokeTimedAsync("WakeQueue", () => _hub.InvokeAsync("WakeQueue"));
     }
 
     public async Task<List<AgentInfo>> GetAgentsAsync()
@@ -362,17 +397,17 @@ public partial class WorkerClient : ObservableObject, IAsyncDisposable, IWorkerC
 
     public async Task RefreshAgentsAsync()
     {
-        await _hub.InvokeAsync("RefreshAgents");
+        await InvokeTimedAsync("RefreshAgents", () => _hub.InvokeAsync("RefreshAgents"));
     }
 
     public async Task<SeedResultDto?> RestoreDefaultAgentsAsync()
-        => await _hub.InvokeAsync<SeedResultDto>("RestoreDefaultAgents");
+        => await InvokeTimedAsync<SeedResultDto>("RestoreDefaultAgents", () => _hub.InvokeAsync<SeedResultDto>("RestoreDefaultAgents"));
 
     private async Task SeedActiveTasksAsync()
     {
         try
         {
-            var active = await _hub.InvokeAsync<List<ActiveTaskDto>>("GetActive");
+            var active = await InvokeTimedAsync<List<ActiveTaskDto>>("GetActive", () => _hub.InvokeAsync<List<ActiveTaskDto>>("GetActive"));
             Dispatcher.UIThread.Post(() =>
             {
                 ActiveTasks.Clear();
@@ -402,18 +437,18 @@ public partial class WorkerClient : ObservableObject, IAsyncDisposable, IWorkerC
 
     public async Task UpdateAppSettingsAsync(AppSettingsDto dto)
     {
-        await _hub.InvokeAsync("UpdateAppSettings", dto);
+        await InvokeTimedAsync("UpdateAppSettings", () => _hub.InvokeAsync("UpdateAppSettings", dto));
     }
 
     public async Task<List<PrimeScheduleDto>> GetPrimeSchedulesAsync()
         => await TryInvokeAsync<List<PrimeScheduleDto>>("ListPrimeSchedules") ?? new List<PrimeScheduleDto>();
 
     public async Task<PrimeScheduleDto?> UpsertPrimeScheduleAsync(PrimeScheduleDto dto)
-        => await _hub.InvokeAsync<PrimeScheduleDto>("UpsertPrimeSchedule", dto);
+        => await InvokeTimedAsync<PrimeScheduleDto>("UpsertPrimeSchedule", () => _hub.InvokeAsync<PrimeScheduleDto>("UpsertPrimeSchedule", dto));
 
     public async Task DeletePrimeScheduleAsync(Guid id)
     {
-        try { await _hub.InvokeAsync("DeletePrimeSchedule", id); }
+        try { await InvokeTimedAsync("DeletePrimeSchedule", () => _hub.InvokeAsync("DeletePrimeSchedule", id)); }
         catch { /* offline */ }
     }
 
@@ -423,27 +458,27 @@ public partial class WorkerClient : ObservableObject, IAsyncDisposable, IWorkerC
         => TryInvokeAsync<string>("GetWeekReport", IsoDay(start), IsoDay(end));
 
     public Task<string> GenerateWeekReportAsync(DateOnly start, DateOnly end)
-        => _hub.InvokeAsync<string>("GenerateWeekReport", IsoDay(start), IsoDay(end));
+        => InvokeTimedAsync<string>("GenerateWeekReport", () => _hub.InvokeAsync<string>("GenerateWeekReport", IsoDay(start), IsoDay(end)));
 
     public Task<bool> RunDailyPrepNowAsync()
-        => _hub.InvokeAsync<bool>("RunDailyPrepNow");
+        => InvokeTimedAsync<bool>("RunDailyPrepNow", () => _hub.InvokeAsync<bool>("RunDailyPrepNow"));
 
-    public Task RefineTaskAsync(string taskId) => _hub.InvokeAsync("RefineTask", taskId);
+    public Task RefineTaskAsync(string taskId) => InvokeTimedAsync("RefineTask", () => _hub.InvokeAsync("RefineTask", taskId));
 
     public Task ClearMyDayAsync()
-        => _hub.InvokeAsync("ClearMyDay");
+        => InvokeTimedAsync("ClearMyDay", () => _hub.InvokeAsync("ClearMyDay"));
 
     public async Task<List<DailyNoteDto>> GetDailyNotesAsync(DateOnly day)
         => await TryInvokeAsync<List<DailyNoteDto>>("GetDailyNotes", IsoDay(day)) ?? new List<DailyNoteDto>();
 
     public async Task<DailyNoteDto?> AddDailyNoteAsync(DateOnly day, string text)
-        => await _hub.InvokeAsync<DailyNoteDto>("AddDailyNote", IsoDay(day), text);
+        => await InvokeTimedAsync<DailyNoteDto>("AddDailyNote", () => _hub.InvokeAsync<DailyNoteDto>("AddDailyNote", IsoDay(day), text));
 
     public async Task UpdateDailyNoteAsync(string id, string text)
-        => await _hub.InvokeAsync("UpdateDailyNote", id, text);
+        => await InvokeTimedAsync("UpdateDailyNote", () => _hub.InvokeAsync("UpdateDailyNote", id, text));
 
     public async Task DeleteDailyNoteAsync(string id)
-        => await _hub.InvokeAsync("DeleteDailyNote", id);
+        => await InvokeTimedAsync("DeleteDailyNote", () => _hub.InvokeAsync("DeleteDailyNote", id));
 
     public async Task<string> GetLastPrepLogAsync()
         => await TryInvokeAsync<string>("GetLastPrepLog") ?? string.Empty;
@@ -456,12 +491,12 @@ public partial class WorkerClient : ObservableObject, IAsyncDisposable, IWorkerC
 
     public async Task UpdateListAsync(UpdateListDto dto)
     {
-        await _hub.InvokeAsync("UpdateList", dto);
+        await InvokeTimedAsync("UpdateList", () => _hub.InvokeAsync("UpdateList", dto));
     }
 
     public async Task UpdateListConfigAsync(UpdateListConfigDto dto)
     {
-        await _hub.InvokeAsync("UpdateListConfig", dto);
+        await InvokeTimedAsync("UpdateListConfig", () => _hub.InvokeAsync("UpdateListConfig", dto));
     }
 
     public Task<ListConfigDto?> GetListConfigAsync(string listId)
@@ -469,37 +504,37 @@ public partial class WorkerClient : ObservableObject, IAsyncDisposable, IWorkerC
 
     public async Task UpdateTaskAgentSettingsAsync(UpdateTaskAgentSettingsDto dto)
     {
-        await _hub.InvokeAsync("UpdateTaskAgentSettings", dto);
+        await InvokeTimedAsync("UpdateTaskAgentSettings", () => _hub.InvokeAsync("UpdateTaskAgentSettings", dto));
     }
 
     public async Task<List<string>> GetRepoImportFoldersAsync()
-        => await _hub.InvokeAsync<List<string>>("GetRepoImportFolders");
+        => await InvokeTimedAsync<List<string>>("GetRepoImportFolders", () => _hub.InvokeAsync<List<string>>("GetRepoImportFolders"));
 
     public Task SetRepoImportFoldersAsync(List<string> folders)
-        => _hub.InvokeAsync("SetRepoImportFolders", folders);
+        => InvokeTimedAsync("SetRepoImportFolders", () => _hub.InvokeAsync("SetRepoImportFolders", folders));
 
     public async Task<List<SessionSkillDto>> GetSessionSkillsAsync()
         => await TryInvokeAsync<List<SessionSkillDto>>("GetSessionSkills") ?? [];
 
     public Task<List<string>> InstallSessionSkillAsync(string url)
-        => _hub.InvokeAsync<List<string>>("InstallSessionSkill", url);
+        => InvokeTimedAsync<List<string>>("InstallSessionSkill", () => _hub.InvokeAsync<List<string>>("InstallSessionSkill", url));
 
     public Task UpdateSessionSkillAsync(string sourceUrl)
-        => _hub.InvokeAsync("UpdateSessionSkill", sourceUrl);
+        => InvokeTimedAsync("UpdateSessionSkill", () => _hub.InvokeAsync("UpdateSessionSkill", sourceUrl));
 
     public Task RemoveSessionSkillAsync(string sourceUrl)
-        => _hub.InvokeAsync("RemoveSessionSkill", sourceUrl);
+        => InvokeTimedAsync("RemoveSessionSkill", () => _hub.InvokeAsync("RemoveSessionSkill", sourceUrl));
 
     public async Task<BaseDirtyWarningDto?> SetTaskStatusAsync(string taskId, ClaudeDo.Data.Models.TaskStatus status)
     {
-        var result = await _hub.InvokeAsync<SetTaskStatusResultDto>("SetTaskStatus", taskId, status.ToString());
+        var result = await InvokeTimedAsync<SetTaskStatusResultDto>("SetTaskStatus", () => _hub.InvokeAsync<SetTaskStatusResultDto>("SetTaskStatus", taskId, status.ToString()));
         return result?.BaseDirty;
     }
 
     public async Task<MergeResultDto?> ApproveReviewAsync(string taskId, string targetBranch)
     {
         LastApproveTarget = targetBranch;
-        return await _hub.InvokeAsync<MergeResultDto>("ApproveReview", taskId, targetBranch);
+        return await InvokeTimedAsync<MergeResultDto>("ApproveReview", () => _hub.InvokeAsync<MergeResultDto>("ApproveReview", taskId, targetBranch));
     }
 
     public Task<MergePreviewDto?> PreviewMergeAsync(string taskId, string targetBranch)
@@ -507,24 +542,24 @@ public partial class WorkerClient : ObservableObject, IAsyncDisposable, IWorkerC
 
     public async Task RejectReviewToQueueAsync(string taskId, string feedback)
     {
-        await _hub.InvokeAsync("RejectReviewToQueue", taskId, feedback);
+        await InvokeTimedAsync("RejectReviewToQueue", () => _hub.InvokeAsync("RejectReviewToQueue", taskId, feedback));
     }
 
     public async Task RejectReviewToIdleAsync(string taskId)
     {
-        await _hub.InvokeAsync("RejectReviewToIdle", taskId);
+        await InvokeTimedAsync("RejectReviewToIdle", () => _hub.InvokeAsync("RejectReviewToIdle", taskId));
     }
 
     public async Task CancelReviewAsync(string taskId)
     {
-        await _hub.InvokeAsync("CancelReview", taskId);
+        await InvokeTimedAsync("CancelReview", () => _hub.InvokeAsync("CancelReview", taskId));
     }
 
     public async Task<WorktreeCleanupDto?> CleanupFinishedWorktreesAsync(string? listId = null)
-        => await _hub.InvokeAsync<WorktreeCleanupDto>("CleanupFinishedWorktrees", listId);
+        => await InvokeTimedAsync<WorktreeCleanupDto>("CleanupFinishedWorktrees", () => _hub.InvokeAsync<WorktreeCleanupDto>("CleanupFinishedWorktrees", listId));
 
     public async Task<WorktreeResetDto?> ResetAllWorktreesAsync()
-        => await _hub.InvokeAsync<WorktreeResetDto>("ResetAllWorktrees");
+        => await InvokeTimedAsync<WorktreeResetDto>("ResetAllWorktrees", () => _hub.InvokeAsync<WorktreeResetDto>("ResetAllWorktrees"));
 
     public async Task<List<WorktreeOverviewDto>> GetWorktreesOverviewAsync(string? listId)
         => await TryInvokeAsync<List<WorktreeOverviewDto>>("GetWorktreesOverview", listId)
@@ -534,7 +569,7 @@ public partial class WorkerClient : ObservableObject, IAsyncDisposable, IWorkerC
     {
         try
         {
-            var ok = await _hub.InvokeAsync<bool>("SetWorktreeState", taskId, newState);
+            var ok = await InvokeTimedAsync<bool>("SetWorktreeState", () => _hub.InvokeAsync<bool>("SetWorktreeState", taskId, newState));
             return (ok, null);
         }
         catch (HubException ex)
@@ -548,63 +583,63 @@ public partial class WorkerClient : ObservableObject, IAsyncDisposable, IWorkerC
     }
 
     public async Task<ForceRemoveResultDto?> ForceRemoveWorktreeAsync(string taskId)
-        => await _hub.InvokeAsync<ForceRemoveResultDto>("ForceRemoveWorktree", taskId);
+        => await InvokeTimedAsync<ForceRemoveResultDto>("ForceRemoveWorktree", () => _hub.InvokeAsync<ForceRemoveResultDto>("ForceRemoveWorktree", taskId));
 
     public async Task<PlanningSessionStartInfo> StartPlanningSessionAsync(string taskId, CancellationToken ct = default)
-        => await _hub.InvokeAsync<PlanningSessionStartInfo>("StartPlanningSessionAsync", taskId, ct);
+        => await InvokeTimedAsync<PlanningSessionStartInfo>("StartPlanningSessionAsync", () => _hub.InvokeAsync<PlanningSessionStartInfo>("StartPlanningSessionAsync", taskId, ct));
 
     public async Task<PlanningSessionResumeInfo> ResumePlanningSessionAsync(string taskId, CancellationToken ct = default)
-        => await _hub.InvokeAsync<PlanningSessionResumeInfo>("ResumePlanningSessionAsync", taskId, ct);
+        => await InvokeTimedAsync<PlanningSessionResumeInfo>("ResumePlanningSessionAsync", () => _hub.InvokeAsync<PlanningSessionResumeInfo>("ResumePlanningSessionAsync", taskId, ct));
 
     public async Task SubmitTaskForReviewAsync(string taskId, CancellationToken ct = default)
-        => await _hub.InvokeAsync("SubmitTaskForReview", taskId, ct);
+        => await InvokeTimedAsync("SubmitTaskForReview", () => _hub.InvokeAsync("SubmitTaskForReview", taskId, ct));
 
     public async Task<LaunchSpec> GetInteractiveLaunchSpecAsync(string taskId, CancellationToken ct = default)
-        => await _hub.InvokeAsync<LaunchSpec>("GetInteractiveLaunchSpec", taskId, ct);
+        => await InvokeTimedAsync<LaunchSpec>("GetInteractiveLaunchSpec", () => _hub.InvokeAsync<LaunchSpec>("GetInteractiveLaunchSpec", taskId, ct));
 
     public async Task<LaunchSpec> GetAdHocLaunchSpecAsync(string directory, CancellationToken ct = default)
-        => await _hub.InvokeAsync<LaunchSpec>("GetAdHocLaunchSpec", directory, ct);
+        => await InvokeTimedAsync<LaunchSpec>("GetAdHocLaunchSpec", () => _hub.InvokeAsync<LaunchSpec>("GetAdHocLaunchSpec", directory, ct));
 
     public async Task<LaunchSpec> GetMergeHelperLaunchSpecAsync(IReadOnlyList<string> taskIds, string listId, CancellationToken ct = default)
-        => await _hub.InvokeAsync<LaunchSpec>("GetMergeHelperLaunchSpec", taskIds, listId, ct);
+        => await InvokeTimedAsync<LaunchSpec>("GetMergeHelperLaunchSpec", () => _hub.InvokeAsync<LaunchSpec>("GetMergeHelperLaunchSpec", taskIds, listId, ct));
 
     public async Task<string> CreateMergeHelperTaskAsync(
         IReadOnlyList<string> taskIds, string listId, string title, string descriptionHeader, CancellationToken ct = default)
-        => await _hub.InvokeAsync<string>("CreateMergeHelperTask", taskIds, listId, title, descriptionHeader, ct);
+        => await InvokeTimedAsync<string>("CreateMergeHelperTask", () => _hub.InvokeAsync<string>("CreateMergeHelperTask", taskIds, listId, title, descriptionHeader, ct));
 
     public async Task<LaunchSpec> GetMergeHelperHandoffLaunchSpecAsync(
         string taskId, IReadOnlyList<string> survivingTaskIds, string nextPhase, CancellationToken ct = default)
-        => await _hub.InvokeAsync<LaunchSpec>("GetMergeHelperHandoffLaunchSpec", taskId, survivingTaskIds, nextPhase, ct);
+        => await InvokeTimedAsync<LaunchSpec>("GetMergeHelperHandoffLaunchSpec", () => _hub.InvokeAsync<LaunchSpec>("GetMergeHelperHandoffLaunchSpec", taskId, survivingTaskIds, nextPhase, ct));
 
     public async Task<LaunchSpec> GetPlanningStartLaunchSpecAsync(string taskId, CancellationToken ct = default)
-        => await _hub.InvokeAsync<LaunchSpec>("GetPlanningStartLaunchSpec", taskId, ct);
+        => await InvokeTimedAsync<LaunchSpec>("GetPlanningStartLaunchSpec", () => _hub.InvokeAsync<LaunchSpec>("GetPlanningStartLaunchSpec", taskId, ct));
 
     public async Task<LaunchSpec> GetPlanningResumeLaunchSpecAsync(string taskId, CancellationToken ct = default)
-        => await _hub.InvokeAsync<LaunchSpec>("GetPlanningResumeLaunchSpec", taskId, ct);
+        => await InvokeTimedAsync<LaunchSpec>("GetPlanningResumeLaunchSpec", () => _hub.InvokeAsync<LaunchSpec>("GetPlanningResumeLaunchSpec", taskId, ct));
 
     public async Task<DiscardPlanningOutcome> DiscardPlanningSessionAsync(string taskId, bool dequeueQueuedChildren = false, CancellationToken ct = default)
-        => await _hub.InvokeAsync<DiscardPlanningOutcome>("DiscardPlanningSessionAsync", taskId, dequeueQueuedChildren, ct);
+        => await InvokeTimedAsync<DiscardPlanningOutcome>("DiscardPlanningSessionAsync", () => _hub.InvokeAsync<DiscardPlanningOutcome>("DiscardPlanningSessionAsync", taskId, dequeueQueuedChildren, ct));
 
     public async Task<int> FinalizePlanningSessionAsync(string taskId, bool queueAgentTasks = true, CancellationToken ct = default)
-        => await _hub.InvokeAsync<int>("FinalizePlanningSessionAsync", taskId, queueAgentTasks, ct);
+        => await InvokeTimedAsync<int>("FinalizePlanningSessionAsync", () => _hub.InvokeAsync<int>("FinalizePlanningSessionAsync", taskId, queueAgentTasks, ct));
 
     public async Task<int> GetPendingDraftCountAsync(string taskId, CancellationToken ct = default)
-        => await _hub.InvokeAsync<int>("GetPendingDraftCountAsync", taskId, ct);
+        => await InvokeTimedAsync<int>("GetPendingDraftCountAsync", () => _hub.InvokeAsync<int>("GetPendingDraftCountAsync", taskId, ct));
 
     public async Task<IReadOnlyList<SubtaskDiffDto>> GetPlanningAggregateAsync(string planningTaskId)
         => await TryInvokeAsync<List<SubtaskDiffDto>>("GetPlanningAggregate", planningTaskId) ?? [];
 
     public async Task<CombinedDiffResultDto?> BuildPlanningIntegrationBranchAsync(string planningTaskId, string targetBranch)
-        => await _hub.InvokeAsync<CombinedDiffResultDto>("BuildPlanningIntegrationBranch", planningTaskId, targetBranch);
+        => await InvokeTimedAsync<CombinedDiffResultDto>("BuildPlanningIntegrationBranch", () => _hub.InvokeAsync<CombinedDiffResultDto>("BuildPlanningIntegrationBranch", planningTaskId, targetBranch));
 
     public async Task ContinuePlanningMergeAsync(string planningTaskId)
     {
-        await _hub.InvokeAsync("ContinuePlanningMerge", planningTaskId);
+        await InvokeTimedAsync("ContinuePlanningMerge", () => _hub.InvokeAsync("ContinuePlanningMerge", planningTaskId));
     }
 
     public async Task AbortPlanningMergeAsync(string planningTaskId)
     {
-        await _hub.InvokeAsync("AbortPlanningMerge", planningTaskId);
+        await InvokeTimedAsync("AbortPlanningMerge", () => _hub.InvokeAsync("AbortPlanningMerge", planningTaskId));
     }
 
     public async Task<IReadOnlyList<PlanningMergeConflictStateDto>> GetActiveExternalPlanningMergeConflictsAsync()
@@ -613,20 +648,20 @@ public partial class WorkerClient : ObservableObject, IAsyncDisposable, IWorkerC
 
     public async Task QueuePlanningSubtasksAsync(string parentTaskId, CancellationToken ct = default)
     {
-        await _hub.InvokeAsync("QueuePlanningSubtasksAsync", parentTaskId, ct);
+        await InvokeTimedAsync("QueuePlanningSubtasksAsync", () => _hub.InvokeAsync("QueuePlanningSubtasksAsync", parentTaskId, ct));
     }
 
     public Task<OnlineInboxStateDto?> GetOnlineInboxStateAsync()
         => TryInvokeAsync<OnlineInboxStateDto>("GetOnlineInboxState");
 
     public async Task SetOnlineInboxConfigAsync(OnlineInboxConfigInputDto input)
-        => await _hub.InvokeAsync("SetOnlineInboxConfig", input);
+        => await InvokeTimedAsync("SetOnlineInboxConfig", () => _hub.InvokeAsync("SetOnlineInboxConfig", input));
 
     public async Task SetOnlineInboxAuthAsync(string refreshToken)
-        => await _hub.InvokeAsync("SetOnlineInboxAuth", refreshToken);
+        => await InvokeTimedAsync("SetOnlineInboxAuth", () => _hub.InvokeAsync("SetOnlineInboxAuth", refreshToken));
 
     public async Task ClearOnlineInboxAuthAsync()
-        => await _hub.InvokeAsync("ClearOnlineInboxAuth");
+        => await InvokeTimedAsync("ClearOnlineInboxAuth", () => _hub.InvokeAsync("ClearOnlineInboxAuth"));
 
     public Task<UsageSnapshotDto?> GetUsageSnapshotAsync()
         => TryInvokeAsync<UsageSnapshotDto>("GetUsageSnapshot");
diff --git a/src/ClaudeDo.Ui/ViewModels/Islands/DetailsIslandViewModel.cs b/src/ClaudeDo.Ui/ViewModels/Islands/DetailsIslandViewModel.cs
index 1133d1aa..05a18f8d 100644
--- a/src/ClaudeDo.Ui/ViewModels/Islands/DetailsIslandViewModel.cs
+++ b/src/ClaudeDo.Ui/ViewModels/Islands/DetailsIslandViewModel.cs
@@ -610,6 +610,8 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase, IDisposable
 
     private async System.Threading.Tasks.Task BindAsync(TaskRowViewModel row, CancellationToken ct)
     {
+        var sw = System.Diagnostics.Stopwatch.StartNew();
+        var ok = false;
         try
         {
             await using var ctx = await _dbFactory.CreateDbContextAsync(ct);
@@ -701,12 +703,16 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase, IDisposable
                 }
             }
             await Merge.RefreshMergePreviewAsync();
+            ok = true;
         }
         catch (OperationCanceledException) { }
+        finally { OperationTiming.Shared.Record("db", "DetailsIsland.BindAsync", sw.Elapsed, ok); }
     }
 
     private async System.Threading.Tasks.Task LoadChildOutcomesAsync(string parentTaskId, CancellationToken ct)
     {
+        var sw = System.Diagnostics.Stopwatch.StartNew();
+        var ok = false;
         try
         {
             await using var ctx = await _dbFactory.CreateDbContextAsync(ct);
@@ -717,6 +723,7 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase, IDisposable
                 .OrderBy(t => t.SortOrder).ThenBy(t => t.CreatedAt)
                 .ToListAsync(ct);
             ct.ThrowIfCancellationRequested();
+            ok = true;
             if (children.Count == 0) return;
 
             ChildOutcomes.Clear();
@@ -749,10 +756,13 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase, IDisposable
         }
         catch (OperationCanceledException) { }
         catch { /* best-effort */ }
+        finally { OperationTiming.Shared.Record("db", "DetailsIsland.LoadChildOutcomesAsync", sw.Elapsed, ok); }
     }
 
     private async System.Threading.Tasks.Task LoadPlanningChildrenAsync(string parentTaskId, CancellationToken ct)
     {
+        var sw = System.Diagnostics.Stopwatch.StartNew();
+        var ok = false;
         try
         {
             await using var ctx = await _dbFactory.CreateDbContextAsync(ct);
@@ -762,6 +772,7 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase, IDisposable
                 .Where(t => t.ParentTaskId == parentTaskId)
                 .ToListAsync(ct);
             ct.ThrowIfCancellationRequested();
+            ok = true;
 
             foreach (var child in children)
             {
@@ -791,6 +802,7 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase, IDisposable
         }
         catch (OperationCanceledException) { }
         catch { /* best-effort */ }
+        finally { OperationTiming.Shared.Record("db", "DetailsIsland.LoadPlanningChildrenAsync", sw.Elapsed, ok); }
     }
 
     private async System.Threading.Tasks.Task RefreshPlanningChildAsync(string childTaskId)
diff --git a/src/ClaudeDo.Ui/ViewModels/Islands/ListsIslandViewModel.cs b/src/ClaudeDo.Ui/ViewModels/Islands/ListsIslandViewModel.cs
index e0804e8a..7b55c19b 100644
--- a/src/ClaudeDo.Ui/ViewModels/Islands/ListsIslandViewModel.cs
+++ b/src/ClaudeDo.Ui/ViewModels/Islands/ListsIslandViewModel.cs
@@ -255,30 +255,37 @@ public sealed partial class ListsIslandViewModel : ViewModelBase, IDisposable
         };
         foreach (var s in smart) { Items.Add(s); SmartLists.Add(s); }
 
-        await using var ctx = await _dbFactory.CreateDbContextAsync(ct);
-        var lists = new ListRepository(ctx);
-        var seedNames = new HashSet<string>(new[] { "My Day", "Important", "Planned" });
-        var dotColors = new[] { "Moss", "Peat", "Sage" };
-        int idx = 0;
-        foreach (var l in await lists.GetAllAsync(ct))
+        var sw = System.Diagnostics.Stopwatch.StartNew();
+        var ok = false;
+        try
         {
-            if (seedNames.Contains(l.Name)) continue;
-            var item = new ListNavItemViewModel
+            await using var ctx = await _dbFactory.CreateDbContextAsync(ct);
+            var lists = new ListRepository(ctx);
+            var seedNames = new HashSet<string>(new[] { "My Day", "Important", "Planned" });
+            var dotColors = new[] { "Moss", "Peat", "Sage" };
+            int idx = 0;
+            foreach (var l in await lists.GetAllAsync(ct))
             {
-                Id = $"user:{l.Id}",
-                Name = l.Name,
-                Kind = ListKind.User,
-                IconKey = "Folder",
-                DotColorKey = dotColors[idx % dotColors.Length],
-                WorkingDir = l.WorkingDir,
-                DefaultCommitType = l.DefaultCommitType,
-                IsManual = l.IsManual,
-                FindingsTracked = l.FindingsTracked,
-            };
-            Items.Add(item);
-            UserLists.Add(item);
-            idx++;
+                if (seedNames.Contains(l.Name)) continue;
+                var item = new ListNavItemViewModel
+                {
+                    Id = $"user:{l.Id}",
+                    Name = l.Name,
+                    Kind = ListKind.User,
+                    IconKey = "Folder",
+                    DotColorKey = dotColors[idx % dotColors.Length],
+                    WorkingDir = l.WorkingDir,
+                    DefaultCommitType = l.DefaultCommitType,
+                    IsManual = l.IsManual,
+                    FindingsTracked = l.FindingsTracked,
+                };
+                Items.Add(item);
+                UserLists.Add(item);
+                idx++;
+            }
+            ok = true;
         }
+        finally { OperationTiming.Shared.Record("db", "ListsIsland.LoadAsync", sw.Elapsed, ok); }
 
         await RefreshCountsAsync(ct);
         SelectedList = Items.FirstOrDefault();
@@ -286,6 +293,8 @@ public sealed partial class ListsIslandViewModel : ViewModelBase, IDisposable
 
     public async Task RefreshCountsAsync(CancellationToken ct = default)
     {
+        var sw = System.Diagnostics.Stopwatch.StartNew();
+        var ok = false;
         try
         {
             await using var ctx = await _dbFactory.CreateDbContextAsync(ct);
@@ -306,9 +315,11 @@ public sealed partial class ListsIslandViewModel : ViewModelBase, IDisposable
                 var filter = _filters.Resolve(item.Id);
                 item.Count = filter is null ? 0 : all.Count(filter.ShouldCount);
             }
+            ok = true;
         }
         catch (OperationCanceledException) { throw; }
         catch { /* best-effort refresh */ }
+        finally { OperationTiming.Shared.Record("db", "ListsIsland.RefreshCountsAsync", sw.Elapsed, ok); }
     }
 
     [RelayCommand]
@@ -382,9 +393,16 @@ public sealed partial class ListsIslandViewModel : ViewModelBase, IDisposable
         MoveWithinCollection(UserLists, source, target, placeBelow);
 
         var orderedIds = UserLists.Select(i => i.Id["user:".Length..]).ToList();
-        await using var ctx = await _dbFactory.CreateDbContextAsync();
-        var lists = new ListRepository(ctx);
-        await lists.ReorderAsync(orderedIds);
+        var sw = System.Diagnostics.Stopwatch.StartNew();
+        var ok = false;
+        try
+        {
+            await using var ctx = await _dbFactory.CreateDbContextAsync();
+            var lists = new ListRepository(ctx);
+            await lists.ReorderAsync(orderedIds);
+            ok = true;
+        }
+        finally { OperationTiming.Shared.Record("db", "ListsIsland.ReorderAsync", sw.Elapsed, ok); }
     }
 
     private static void MoveWithinCollection(
diff --git a/src/ClaudeDo.Ui/ViewModels/Islands/TasksIslandViewModel.cs b/src/ClaudeDo.Ui/ViewModels/Islands/TasksIslandViewModel.cs
index da2466ba..1e52b062 100644
--- a/src/ClaudeDo.Ui/ViewModels/Islands/TasksIslandViewModel.cs
+++ b/src/ClaudeDo.Ui/ViewModels/Islands/TasksIslandViewModel.cs
@@ -360,6 +360,8 @@ public sealed partial class TasksIslandViewModel : ViewModelBase, IDisposable
     private async Task LoadForListAsync(
         ListNavItemViewModel list, CancellationToken ct, Dictionary<string, TaskRowViewModel>? reusable)
     {
+        var sw = System.Diagnostics.Stopwatch.StartNew();
+        var ok = false;
         try
         {
             await using var db = await _dbFactory.CreateDbContextAsync(ct);
@@ -460,8 +462,10 @@ public sealed partial class TasksIslandViewModel : ViewModelBase, IDisposable
 
             Regroup();
             UpdateSubtitle();
+            ok = true;
         }
         catch (OperationCanceledException) { }
+        finally { OperationTiming.Shared.Record("db", "TasksIsland.LoadForListAsync", sw.Elapsed, ok); }
     }
 
     internal void Regroup()
@@ -816,17 +820,24 @@ public sealed partial class TasksIslandViewModel : ViewModelBase, IDisposable
         var listId = _currentList.Id["user:".Length..];
         var orderedIds = Items.Select(i => i.Id).ToList();
 
-        await using var db = await _dbFactory.CreateDbContextAsync();
-        var idSet = orderedIds.ToHashSet();
-        var entities = await db.Tasks
-            .Where(t => t.ListId == listId && idSet.Contains(t.Id))
-            .ToListAsync();
-        for (int i = 0; i < orderedIds.Count; i++)
+        var sw = System.Diagnostics.Stopwatch.StartNew();
+        var ok = false;
+        try
         {
-            var e = entities.FirstOrDefault(x => x.Id == orderedIds[i]);
-            if (e is not null) e.SortOrder = i;
+            await using var db = await _dbFactory.CreateDbContextAsync();
+            var idSet = orderedIds.ToHashSet();
+            var entities = await db.Tasks
+                .Where(t => t.ListId == listId && idSet.Contains(t.Id))
+                .ToListAsync();
+            for (int i = 0; i < orderedIds.Count; i++)
+            {
+                var e = entities.FirstOrDefault(x => x.Id == orderedIds[i]);
+                if (e is not null) e.SortOrder = i;
+            }
+            await db.SaveChangesAsync();
+            ok = true;
         }
-        await db.SaveChangesAsync();
+        finally { OperationTiming.Shared.Record("db", "TasksIsland.ReorderAsync", sw.Elapsed, ok); }
     }
 
     private static void MoveWithinCollection<T>(
@@ -990,17 +1001,22 @@ public sealed partial class TasksIslandViewModel : ViewModelBase, IDisposable
             if (!ok) return;
         }
 
-        await using var db = await _dbFactory.CreateDbContextAsync();
-        var repo = new TaskRepository(db);
-        foreach (var row in toDelete)
+        var sw = System.Diagnostics.Stopwatch.StartNew();
+        try
         {
-            try
+            await using var db = await _dbFactory.CreateDbContextAsync();
+            var repo = new TaskRepository(db);
+            foreach (var row in toDelete)
             {
-                await repo.DeleteAsync(row.Id);
-                Items.Remove(row);
+                try
+                {
+                    await repo.DeleteAsync(row.Id);
+                    Items.Remove(row);
+                }
+                catch { /* still referenced by open child tasks; leave it visible */ }
             }
-            catch { /* still referenced by open child tasks; leave it visible */ }
         }
+        finally { OperationTiming.Shared.Record("db", "TasksIsland.ClearCompletedAsync", sw.Elapsed, ok: true); }
 
         Regroup();
         UpdateSubtitle();
@@ -1476,6 +1492,8 @@ public sealed partial class TasksIslandViewModel : ViewModelBase, IDisposable
         }
 
         List<TaskEntity> entities;
+        var sw = System.Diagnostics.Stopwatch.StartNew();
+        var dbOk = false;
         try
         {
             var idSet = ids.ToHashSet();
@@ -1485,6 +1503,7 @@ public sealed partial class TasksIslandViewModel : ViewModelBase, IDisposable
                 .Include(t => t.Worktree)
                 .Where(t => idSet.Contains(t.Id))
                 .ToListAsync(ct);
+            dbOk = true;
         }
         catch (OperationCanceledException) { return; }
         catch (Exception ex)
@@ -1492,6 +1511,7 @@ public sealed partial class TasksIslandViewModel : ViewModelBase, IDisposable
             System.Diagnostics.Debug.WriteLine($"TasksIsland: reconcile tick failed ({ex.Message})");
             return;
         }
+        finally { OperationTiming.Shared.Record("db", "TasksIsland.ReconcileTickAsync", sw.Elapsed, dbOk); }
 
         if (ReconcileTickTestBarrier is { } barrier) await barrier();
 
diff --git a/tests/ClaudeDo.Ui.Tests/Services/OperationTimingTests.cs b/tests/ClaudeDo.Ui.Tests/Services/OperationTimingTests.cs
new file mode 100644
index 00000000..05a52c22
--- /dev/null
+++ b/tests/ClaudeDo.Ui.Tests/Services/OperationTimingTests.cs
@@ -0,0 +1,70 @@
+using System.Text.Json;
+using ClaudeDo.Ui.Services;
+using Xunit;
+
+namespace ClaudeDo.Ui.Tests.Services;
+
+public class OperationTimingTests
+{
+    [Fact]
+    public void Record_AppendsOneWellFormedNdjsonLinePerOperation()
+    {
+        var dir = Path.Combine(Path.GetTempPath(), "claudedo_optiming_" + Guid.NewGuid().ToString("N"));
+        var path = Path.Combine(dir, "operation-timing.ndjson");
+        var sink = new OperationTiming(path);
+
+        try
+        {
+            sink.Record("hub", "RunNow", TimeSpan.FromMilliseconds(42), ok: true);
+            sink.Record("db", "TasksIsland.LoadForList", TimeSpan.FromMilliseconds(7), ok: false);
+
+            var lines = File.ReadAllLines(path);
+            Assert.Equal(2, lines.Length);
+
+            using var doc1 = JsonDocument.Parse(lines[0]);
+            var root1 = doc1.RootElement;
+            Assert.Equal("hub", root1.GetProperty("kind").GetString());
+            Assert.Equal("RunNow", root1.GetProperty("op").GetString());
+            Assert.Equal(42, root1.GetProperty("ms").GetInt64());
+            Assert.True(root1.GetProperty("ok").GetBoolean());
+            Assert.True(root1.TryGetProperty("ts", out _));
+
+            using var doc2 = JsonDocument.Parse(lines[1]);
+            var root2 = doc2.RootElement;
+            Assert.Equal("db", root2.GetProperty("kind").GetString());
+            Assert.Equal("TasksIsland.LoadForList", root2.GetProperty("op").GetString());
+            Assert.Equal(7, root2.GetProperty("ms").GetInt64());
+            Assert.False(root2.GetProperty("ok").GetBoolean());
+        }
+        finally
+        {
+            if (Directory.Exists(dir)) Directory.Delete(dir, recursive: true);
+        }
+    }
+
+    [Fact]
+    public void Record_SwallowsWriteFailureInsteadOfThrowing()
+    {
+        // A plain file sitting where the sink expects a directory makes Directory.CreateDirectory
+        // throw -- standing in for the disk-full/locked-file/no-permission failures this sink
+        // must survive without disturbing the caller.
+        var root = Path.Combine(Path.GetTempPath(), "claudedo_optiming_invalid_" + Guid.NewGuid().ToString("N"));
+        Directory.CreateDirectory(root);
+        var blockingFile = Path.Combine(root, "not-a-directory");
+        File.WriteAllText(blockingFile, "");
+        var targetPath = Path.Combine(blockingFile, "timing.ndjson");
+        var sink = new OperationTiming(targetPath);
+
+        try
+        {
+            var exception = Record.Exception(() => sink.Record("hub", "RunNow", TimeSpan.FromMilliseconds(1), ok: true));
+
+            Assert.Null(exception);
+            Assert.False(File.Exists(targetPath));
+        }
+        finally
+        {
+            Directory.Delete(root, recursive: true);
+        }
+    }
+}