# Step 8 Performance/State Round 1

## Coverage

- Reviewed and patched:
  - `iphone/Werkout_ios/DataStore.swift`
  - `iphone/Werkout_ios/Views/WorkoutDetail/WorkoutDetailView.swift`
  - `iphone/Werkout_ios/Views/WorkoutDetail/ExerciseListView.swift`
  - `WekoutThotViewer/WekoutThotViewer/ContentView.swift`
  - `iphone/Werkout_ios/BridgeModule.swift`
  - `iphone/Werkout_ios/BridgeModule+Watch.swift`
  - `iphone/Werkout_ios/BridgeModule+Timer.swift`
  - `iphone/Werkout_watch Watch App/WatchWorkout.swift`
- Validation run:
  - `./scripts/smoke/smoke_all.sh`

## Fixes

1. Coalesced concurrent `fetchAllData` requests
   - `DataStore` now queues completion handlers while a fetch is active to prevent overlapping network fan-out and state churn.

2. Reduced AVPlayer churn in iOS workout detail
   - Reuses current player for same URL by seeking to start instead of recreating `AVPlayer` each time exercise/video updates.

3. Reduced AVPlayer churn in iOS exercise preview sheet
   - Added preview URL tracking; same URL now replays without allocating a new player.

4. Reduced AVPlayer churn in tvOS content loop
   - Same URL replay now seeks/replays existing player rather than recreating.

5. Capped queued watch messages on iOS bridge
   - Added queue cap to prevent unbounded growth while watch is disconnected.

6. Added queue fallback for send failures
   - Failed reachable send now re-queues payload for later delivery.

7. Improved timer power behavior
   - Added timer tolerance to workout/exercise timers.

8. Fixed watch heart-rate loop early-return behavior
   - Non-heart sample types now `continue` instead of exiting handler early.

## Validation

- Smoke suite passed:
  - token scan
  - SharedCore tests
  - iOS/watchOS/tvOS builds