diff --git a/.planning/ROADMAP.md b/.planning/ROADMAP.md index 5883c77..360d3f9 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:** 2/4 plans executed +**Plans:** 3/4 plans executed 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 | 2/4 | In Progress| | - | +| 14. Performance Optimization | 3/4 | In Progress| | - | --- *Roadmap created: 2026-02-27* diff --git a/.planning/STATE.md b/.planning/STATE.md index e32bb3e..bd48e32 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: 2 of 4 in Phase (Plans 01, 02 complete) -Status: Plan 14-01 complete — CSS containment & GPU scroll promotion -Progress: ████████████████░░░░ Phase 14 in progress (2/4 plans) -Last activity: 2026-03-14 — Completed 14-01 CSS containment & GPU scroll promotion +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 ### Phase Overview @@ -37,7 +37,7 @@ Last activity: 2026-03-14 — Completed 14-01 CSS containment & GPU scroll promo | 11. Per-Library Scan Pipeline | Complete (3/3 plans) ✅ | | 12. Library CRUD & Data Integrity | In progress (1/2 plans) | | 13. Library Views & Phantom Tracks | Not started | -| 14. Performance Optimization | In progress (2/4 plans) | +| 14. Performance Optimization | In progress (4/4 plans, checkpoint pending) | ## Performance Metrics @@ -59,6 +59,7 @@ Last activity: 2026-03-14 — Completed 14-01 CSS containment & GPU scroll promo | Phase 12-01 P01 | 6 min | 2 tasks | 6 files | | Phase 14-02 P02 | 1 min | 1 task | 1 file | | Phase 14-01 P01 | 3 min | 2 tasks | 7 files | +| Phase 14-04 P04 | 2 min | 2 tasks | 3 files | ## Accumulated Context @@ -132,6 +133,8 @@ 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 | +| 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 | ### Warnings (carry forward) @@ -159,9 +162,9 @@ 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 01 — added CSS containment to app shell layout boundaries and GPU-composited scrolling to all 6 scroll-heavy components with content-visibility on album cards. -**Where we stopped:** Completed 14-01-PLAN.md — Plan 01 of Phase 14 complete (Plans 01, 02 done) -**Next action:** Execute remaining Phase 14 plans (14-03 store optimizations, 14-04 rendering optimizations) +**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) --- *State initialized: 2026-02-27* @@ -174,4 +177,4 @@ 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 14-01-PLAN.md (Phase 14 Plan 01 complete)* +*Last updated: 2026-03-14 — Completed 14-04-PLAN.md Tasks 1-2 (Phase 14 Plan 04 awaiting checkpoint)* diff --git a/.planning/phases/14-performance-optimization/14-04-SUMMARY.md b/.planning/phases/14-performance-optimization/14-04-SUMMARY.md new file mode 100644 index 0000000..5f9e642 --- /dev/null +++ b/.planning/phases/14-performance-optimization/14-04-SUMMARY.md @@ -0,0 +1,93 @@ +--- +phase: 14-performance-optimization +plan: 04 +subsystem: frontend +tags: [scroll, requestAnimationFrame, profiling, pprof, devtools, performance] + +# Dependency graph +requires: + - phase: 14-performance-optimization + provides: CSS containment and GPU scroll layer promotion (Plan 01), view caching navigation (Plan 02) +provides: + - RAF-throttled scroll position saving for cover grid + - overflow-anchor CSS on queue panel virtualizer + - Performance profiling guide (docs/PROFILING.md) +affects: [cover-grid, queue-panel, developer-documentation] + +# Tech tracking +tech-stack: + added: [] + patterns: [RAF-throttled scroll saves instead of debounce, overflow-anchor for virtualizer scroll containers] + +key-files: + created: + - docs/PROFILING.md + modified: + - frontend/src/components/cover-grid/scroll-manager.ts + - frontend/src/components/queue-panel/queue-panel.ts + +key-decisions: + - "Keep monkey-patch alongside overflow-anchor: CSS overflow-anchor disables browser scroll anchoring but not lit-virtualizer's internal _correctScrollError, so the monkey-patch is still needed for scrollbar drag on large lists" + - "RAF throttle over debounce for scroll saves: saves position once per frame during scrolling instead of only after scrolling stops, preventing lost positions on quick navigation" + +patterns-established: + - "RAF-throttled scroll position saving: use requestAnimationFrame guard pattern instead of setTimeout debounce for continuous scroll position tracking" + +requirements-completed: [PERF-SCROLL-03, PERF-DIAG-01] + +# Metrics +duration: 2min +completed: 2026-03-14 +--- + +# Phase 14 Plan 04: Scroll Optimization & Profiling Guide Summary + +**RAF-throttled scroll position saves for cover grid, overflow-anchor on queue panel virtualizer, and comprehensive performance profiling guide** + +## Performance + +- **Duration:** 2 min +- **Started:** 2026-03-14T17:49:56Z +- **Completed:** 2026-03-14T17:52:54Z +- **Tasks:** 2 completed, 1 pending checkpoint +- **Files modified:** 3 + +## Accomplishments +- Cover grid scroll position saves are now RAF-throttled (once per ~16ms frame) instead of 100ms debounced, capturing position during continuous scrolling +- Queue panel lit-virtualizer has `overflow-anchor: none` CSS; monkey-patch retained with expanded documentation explaining why CSS alone is insufficient +- Comprehensive profiling guide created covering pprof backend profiling, Chrome DevTools frontend profiling, and specific diagnostic workflows + +## Task Commits + +Each task was committed atomically: + +1. **Task 1: Optimize scroll event handling and clean up queue panel scroll hack** - `6ca0b3c` (perf) +2. **Task 2: Create performance profiling guide** - `1ec8f82` (docs) +3. **Task 3: Verify performance improvements** - *pending checkpoint:human-verify* + +## Files Created/Modified +- `frontend/src/components/cover-grid/scroll-manager.ts` - Replaced debounced scroll save with RAF-throttled save +- `frontend/src/components/queue-panel/queue-panel.ts` - Added overflow-anchor: none CSS, expanded monkey-patch comments +- `docs/PROFILING.md` - Performance profiling guide with backend, frontend, and workflow sections + +## Decisions Made +- **Keep monkey-patch alongside overflow-anchor:** CSS `overflow-anchor: none` disables browser-native scroll anchoring but does not affect lit-virtualizer's internal `_correctScrollError()` method. The monkey-patch is still needed to suppress that internal correction during native scrollbar drag on large lists (20k+ items). +- **RAF throttle over debounce:** requestAnimationFrame guard pattern fires once per frame (~16ms at 60fps) during active scrolling, unlike debounce which only fires after scrolling stops. This prevents lost positions if the user navigates away during scrolling. + +## Deviations from Plan + +None - plan executed exactly as written. + +## Issues Encountered +None + +## User Setup Required +None - no external service configuration required. + +## Next Phase Readiness +- Task 3 (human-verify checkpoint) pending: user verification of scroll smoothness, navigation speed, and profiling guide +- After checkpoint approval, Phase 14 is complete and ready for transition + +--- +*Phase: 14-performance-optimization* +*Completed: 2026-03-14*