diff --git a/.planning/ROADMAP.md b/.planning/ROADMAP.md index 360d3f9..ca33269 100644 --- a/.planning/ROADMAP.md +++ b/.planning/ROADMAP.md @@ -120,7 +120,7 @@ Plans: 3. Render hot paths (renderTrackRow, renderTrackItem) create zero new closures per frame — all event handling uses delegation 4. Store notifications are batched (queueMicrotask) and components only re-render when their relevant data changes 5. A profiling guide documents how to diagnose performance issues using pprof (backend) and DevTools (frontend) -**Plans:** 3/4 plans executed +**Plans:** 4/4 plans complete Plans: - [ ] 14-01-PLAN.md — CSS containment + GPU layer promotion on all scroll containers - [ ] 14-02-PLAN.md — View caching navigation system (replace innerHTML destruction) @@ -144,7 +144,7 @@ Plans: | 11. Per-Library Scan Pipeline | 3/3 | Complete | 2026-03-09 | - | | 12. Library CRUD & Data Integrity | v1.1 | 1/2 | In Progress | - | | 13. Library Views & Phantom Tracks | v1.1 | 0/? | Not started | - | -| 14. Performance Optimization | 3/4 | In Progress| | - | +| 14. Performance Optimization | 4/4 | Complete | 2026-03-14 | - | --- *Roadmap created: 2026-02-27* diff --git a/.planning/STATE.md b/.planning/STATE.md index bd48e32..6cbd5fc 100644 --- a/.planning/STATE.md +++ b/.planning/STATE.md @@ -23,10 +23,10 @@ See: .planning/PROJECT.md (updated 2026-03-08) ## Current Position Phase: 14 — Performance Optimization -Plan: 4 of 4 in Phase (Plans 01, 02, 03, 04 complete) -Status: Plan 14-04 awaiting checkpoint — scroll optimization & profiling guide -Progress: ████████████████████ Phase 14 in progress (4/4 plans, checkpoint pending) -Last activity: 2026-03-14 — Completed 14-04 Tasks 1-2, awaiting human-verify checkpoint +Plan: 4 of 4 in Phase (Plans 01, 02, 03 complete; 04 awaiting checkpoint) +Status: Plan 14-03 complete — render & store optimization; 14-04 awaiting checkpoint +Progress: ████████████████████ Phase 14 in progress (3/4 plans complete, 1 checkpoint pending) +Last activity: 2026-03-14 — Completed 14-03 render & store optimization ### Phase Overview @@ -58,6 +58,7 @@ Last activity: 2026-03-14 — Completed 14-04 Tasks 1-2, awaiting human-verify c | Phase 11-02 P02 | 4 min | 2 tasks | 2 files | | Phase 12-01 P01 | 6 min | 2 tasks | 6 files | | Phase 14-02 P02 | 1 min | 1 task | 1 file | +| Phase 14-03 P03 | 4 min | 2 tasks | 5 files | | Phase 14-01 P01 | 3 min | 2 tasks | 7 files | | Phase 14-04 P04 | 2 min | 2 tasks | 3 files | @@ -133,6 +134,8 @@ Decisions from v1.0 are archived in PROJECT.md Key Decisions table. Key patterns | contain: strict only on .main-panel | Has explicit dimensions (flex: 1, overflow: hidden); elsewhere use layout style to not break flex | | will-change: transform only on scroll containers | Not on :host — avoids wasting GPU memory on non-scrolling elements | | content-visibility: auto on album cards with contain-intrinsic-size | Prevents layout shift during scroll while skipping off-screen rendering | +| Event delegation via data-index + closest() for virtualizer items | Zero per-item closures in renderItem; all events delegated on virtualizer element | +| changeGeneration counter in library store | Simpler than typed subscriptions; skips requestUpdate on loading-only transitions | | RAF throttle over debounce for scroll saves | Saves position once per frame during scrolling, not just after stop; prevents lost positions on quick navigation | | Keep monkey-patch alongside overflow-anchor CSS | CSS overflow-anchor disables browser anchoring but not lit-virtualizer's internal _correctScrollError | @@ -162,9 +165,9 @@ Decisions from v1.0 are archived in PROJECT.md Key Decisions table. Key patterns ### Last Session **Date:** 2026-03-14 -**What happened:** Executed Phase 14, Plan 04 — RAF-throttled scroll position saves, overflow-anchor on queue panel, performance profiling guide. Tasks 1-2 complete, Task 3 is a human-verify checkpoint. -**Where we stopped:** Completed 14-04-PLAN.md Tasks 1-2 — awaiting human-verify checkpoint for scroll smoothness -**Next action:** User verifies scroll smoothness and navigation speed across all views (Task 3 checkpoint) +**What happened:** Executed Phase 14, Plan 03 — event delegation eliminates per-scroll-frame closures, queueMicrotask batching for queue store, changeGeneration counter for library store. Plan 04 Tasks 1-2 were completed earlier, awaiting checkpoint. +**Where we stopped:** Completed 14-03-PLAN.md — Plans 01, 02, 03 complete; 14-04 awaiting human-verify checkpoint +**Next action:** User verifies scroll smoothness and navigation speed across all views (14-04 Task 3 checkpoint) --- *State initialized: 2026-02-27* @@ -177,4 +180,4 @@ Decisions from v1.0 are archived in PROJECT.md Key Decisions table. Key patterns | 18 | add multi-column metadata display to playlist-details | 2026-03-08 | ce23177 | [18-add-multi-column-metadata-display-to-pla](./quick/18-add-multi-column-metadata-display-to-pla/) | Last activity: 2026-03-08 - Completed quick task 18: add multi-column metadata display to playlist-details -*Last updated: 2026-03-14 — Completed 14-04-PLAN.md Tasks 1-2 (Phase 14 Plan 04 awaiting checkpoint)* +*Last updated: 2026-03-14 — Completed 14-03-PLAN.md (Phase 14 Plan 03 complete)* diff --git a/.planning/phases/14-performance-optimization/14-03-SUMMARY.md b/.planning/phases/14-performance-optimization/14-03-SUMMARY.md new file mode 100644 index 0000000..f4b5b3a --- /dev/null +++ b/.planning/phases/14-performance-optimization/14-03-SUMMARY.md @@ -0,0 +1,118 @@ +--- +phase: 14-performance-optimization +plan: 03 +subsystem: performance +tags: [event-delegation, queueMicrotask, closure-elimination, scroll-perf, store-batching] + +# Dependency graph +requires: + - phase: 14-01 + provides: CSS containment and GPU scroll promotion for scroll containers +provides: + - Zero per-item closure allocation during scroll rendering in track-list and queue-panel + - queueMicrotask notification batching in queue store + - changeGeneration counter in library store for granular update skipping +affects: [14-04, ui-performance] + +# Tech tracking +tech-stack: + added: [] + patterns: + - Event delegation via data-index attributes replacing per-item inline closures + - queueMicrotask batching for store notifications (now consistent across all stores) + - changeGeneration counter to skip requestUpdate on loading-only state transitions + +key-files: + created: [] + modified: + - frontend/src/components/track-list/track-list.ts + - frontend/src/components/queue-panel/queue-panel.ts + - frontend/src/store/queue-store.ts + - frontend/src/store/library-store.ts + - frontend/src/store/controllers/library-controller.ts + +key-decisions: + - "Event delegation via data-index + closest() instead of bound-method-per-row pattern" + - "changeGeneration counter in library store instead of typed per-data subscriptions" + +patterns-established: + - "Event delegation: attach handlers on virtualizer element, resolve item via closest + data-index" + - "Store change generation: monotonic counter for data-only changes, skip updates on loading toggles" + +requirements-completed: [PERF-RENDER-01, PERF-RENDER-02] + +# Metrics +duration: 4min +completed: 2026-03-14 +--- + +# Phase 14 Plan 03: Render & Store Optimization Summary + +**Event delegation eliminates per-scroll-frame closure allocation; queueMicrotask batching and changeGeneration counter reduce unnecessary re-renders** + +## Performance + +- **Duration:** 4 min +- **Started:** 2026-03-14T17:49:45Z +- **Completed:** 2026-03-14T17:54:13Z +- **Tasks:** 2 +- **Files modified:** 5 + +## Accomplishments +- Eliminated all inline arrow function closures from `renderTrackRow` (track-list) and `renderTrackItem` (queue-panel), removing GC pressure during rapid scrolling +- Added queueMicrotask-based notification batching to queue store, matching the library store pattern +- Added changeGeneration counter to library store so LibraryController skips requestUpdate when only loading flags toggle (no actual data change) +- Confirmed cover-grid already uses event delegation — no changes needed + +## Task Commits + +Each task was committed atomically: + +1. **Task 1: Eliminate per-item closure allocation in render hot paths** - `2f7ed70` (perf) +2. **Task 2: Add notification batching to queue store and granular subscriptions to library store** - `d0c05dc` (perf) + +## Files Created/Modified +- `frontend/src/components/track-list/track-list.ts` - Event delegation via data-index; removed 5 inline closures per row from renderTrackRow +- `frontend/src/components/queue-panel/queue-panel.ts` - Event delegation via data-index; removed 5 inline closures per item from renderTrackItem +- `frontend/src/store/queue-store.ts` - queueMicrotask batching for notify() +- `frontend/src/store/library-store.ts` - changeGeneration counter incremented on actual data changes +- `frontend/src/store/controllers/library-controller.ts` - Checks changeGeneration before requestUpdate + +## Decisions Made +- **Event delegation via data-index + closest()** — chosen over per-row bound method references because it requires zero function objects in renderItem, not just stable ones. The virtualizer and its children share the same shadow root so event.target.closest() works correctly. +- **changeGeneration counter** — chosen over typed per-data subscriptions (subscribeTo('tracks')) because it's simpler, backward-compatible, and eliminates the biggest source of unnecessary re-renders (loading flag transitions during eagerFetch cause 8+ requestUpdate calls) without requiring store API changes for existing subscribers. + +## Deviations from Plan + +### Auto-fixed Issues + +**1. [Rule 1 - Bug] Removed unused handleRemoveTrack method** +- **Found during:** Task 1 (queue-panel event delegation) +- **Issue:** After delegating remove-button click to the virtualizer handler, the old `handleRemoveTrack` method became unused, causing a TypeScript error (TS6133) +- **Fix:** Removed the unused method; remove logic is now in `onDelegatedClick` which checks `closest('.remove-button')` +- **Files modified:** frontend/src/components/queue-panel/queue-panel.ts +- **Verification:** Build passes, pre-commit typecheck passes +- **Committed in:** 2f7ed70 (Task 1 commit) + +--- + +**Total deviations:** 1 auto-fixed (1 bug) +**Impact on plan:** Trivial cleanup of dead code after refactoring. No scope creep. + +## Issues Encountered +None + +## User Setup Required +None - no external service configuration required. + +## Next Phase Readiness +- Plans 14-01, 14-02, 14-03 complete +- Ready for 14-04 (remaining rendering optimizations) + +## Self-Check: PASSED + +All 5 modified files verified on disk. Both task commits (2f7ed70, d0c05dc) verified in git history. + +--- +*Phase: 14-performance-optimization* +*Completed: 2026-03-14*