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docs(14-04): complete scroll optimization & profiling guide plan

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- SUMMARY.md with task commits, decisions, and metrics
- STATE.md updated with plan progress and session continuity
- ROADMAP.md updated with Phase 14 plan progress
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yonlu
2026-03-14 13:54:36 -04:00
parent d0c05dc1d4
commit 74473d4386
3 changed files with 107 additions and 11 deletions
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.planning/ROADMAP.md
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@@ -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*
.planning/STATE.md
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@@ -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)*
.planning/phases/14-performance-optimization/14-04-SUMMARY.md
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---
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*