docs(14-01): complete CSS containment & GPU scroll promotion plan
- SUMMARY.md with 2 tasks, 7 files, 3 min duration - STATE.md updated with plan position, metrics, decisions - ROADMAP.md updated with plan progress (2/4)
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@@ -120,7 +120,7 @@ Plans:
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3. Render hot paths (renderTrackRow, renderTrackItem) create zero new closures per frame — all event handling uses delegation
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4. Store notifications are batched (queueMicrotask) and components only re-render when their relevant data changes
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5. A profiling guide documents how to diagnose performance issues using pprof (backend) and DevTools (frontend)
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**Plans:** 1/4 plans executed
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**Plans:** 2/4 plans executed
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Plans:
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- [ ] 14-01-PLAN.md — CSS containment + GPU layer promotion on all scroll containers
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- [ ] 14-02-PLAN.md — View caching navigation system (replace innerHTML destruction)
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@@ -144,7 +144,7 @@ Plans:
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| 11. Per-Library Scan Pipeline | 3/3 | Complete | 2026-03-09 | - |
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| 12. Library CRUD & Data Integrity | v1.1 | 1/2 | In Progress | - |
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| 13. Library Views & Phantom Tracks | v1.1 | 0/? | Not started | - |
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| 14. Performance Optimization | 1/4 | In Progress| | - |
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| 14. Performance Optimization | 2/4 | In Progress| | - |
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---
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*Roadmap created: 2026-02-27*
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@@ -23,10 +23,10 @@ See: .planning/PROJECT.md (updated 2026-03-08)
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## Current Position
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Phase: 14 — Performance Optimization
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Plan: 1 of 4 in Phase (Plan 02 complete)
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Status: Plan 14-02 complete — view caching navigation system
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Progress: ████████████████░░░░ Phase 14 in progress (1/4 plans)
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Last activity: 2026-03-14 — Completed 14-02 view caching navigation
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Plan: 2 of 4 in Phase (Plans 01, 02 complete)
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Status: Plan 14-01 complete — CSS containment & GPU scroll promotion
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Progress: ████████████████░░░░ Phase 14 in progress (2/4 plans)
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Last activity: 2026-03-14 — Completed 14-01 CSS containment & GPU scroll promotion
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### Phase Overview
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@@ -37,7 +37,7 @@ Last activity: 2026-03-14 — Completed 14-02 view caching navigation
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| 11. Per-Library Scan Pipeline | Complete (3/3 plans) ✅ |
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| 12. Library CRUD & Data Integrity | In progress (1/2 plans) |
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| 13. Library Views & Phantom Tracks | Not started |
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| 14. Performance Optimization | In progress (1/4 plans) |
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| 14. Performance Optimization | In progress (2/4 plans) |
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## Performance Metrics
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@@ -58,6 +58,7 @@ Last activity: 2026-03-14 — Completed 14-02 view caching navigation
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| Phase 11-02 P02 | 4 min | 2 tasks | 2 files |
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| Phase 12-01 P01 | 6 min | 2 tasks | 6 files |
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| Phase 14-02 P02 | 1 min | 1 task | 1 file |
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| Phase 14-01 P01 | 3 min | 2 tasks | 7 files |
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## Accumulated Context
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@@ -128,6 +129,9 @@ Decisions from v1.0 are archived in PROJECT.md Key Decisions table. Key patterns
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| Primary views cached, detail views ephemeral | Detail views depend on entity IDs that change; caching would show stale content |
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| Inline style.display toggle over CSS class | Simpler, no specificity issues, empty string restores natural display value |
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| viewCache bounded at 6 entries | One per primary view — negligible memory since data is already in store caches |
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| contain: strict only on .main-panel | Has explicit dimensions (flex: 1, overflow: hidden); elsewhere use layout style to not break flex |
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| will-change: transform only on scroll containers | Not on :host — avoids wasting GPU memory on non-scrolling elements |
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| content-visibility: auto on album cards with contain-intrinsic-size | Prevents layout shift during scroll while skipping off-screen rendering |
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### Warnings (carry forward)
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@@ -155,9 +159,9 @@ Decisions from v1.0 are archived in PROJECT.md Key Decisions table. Key patterns
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### Last Session
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**Date:** 2026-03-14
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**What happened:** Executed Phase 14, Plan 02 — replaced innerHTML navigation with view caching system. Primary views (tracks, albums, artists, genres, playlists, settings) are now created once and kept in DOM with display toggle instead of destruction/recreation.
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**Where we stopped:** Completed 14-02-PLAN.md — Plan 02 of Phase 14 complete
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**Next action:** Execute remaining Phase 14 plans (14-01 CSS containment, 14-03 store optimizations, 14-04 rendering optimizations)
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**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.
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**Where we stopped:** Completed 14-01-PLAN.md — Plan 01 of Phase 14 complete (Plans 01, 02 done)
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**Next action:** Execute remaining Phase 14 plans (14-03 store optimizations, 14-04 rendering optimizations)
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---
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*State initialized: 2026-02-27*
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@@ -170,4 +174,4 @@ Decisions from v1.0 are archived in PROJECT.md Key Decisions table. Key patterns
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| 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/) |
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Last activity: 2026-03-08 - Completed quick task 18: add multi-column metadata display to playlist-details
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*Last updated: 2026-03-14 — Completed 14-02-PLAN.md (Phase 14 Plan 02 complete)*
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*Last updated: 2026-03-14 — Completed 14-01-PLAN.md (Phase 14 Plan 01 complete)*
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@@ -0,0 +1,103 @@
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---
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phase: 14-performance-optimization
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plan: 01
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subsystem: ui
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tags: [css-containment, gpu-compositing, will-change, content-visibility, scroll-performance]
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# Dependency graph
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requires: []
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provides:
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- CSS containment on all app shell layout boundaries
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- GPU-composited scrolling on all 6 scroll-heavy components
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- content-visibility auto on album cards for off-screen rendering skip
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affects: [14-performance-optimization]
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# Tech tracking
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tech-stack:
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added: []
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patterns: [CSS contain for layout isolation, will-change transform for GPU scroll promotion, content-visibility auto for off-screen rendering skip]
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key-files:
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created: []
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modified:
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- frontend/index.css
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- frontend/src/components/cover-grid/cover-grid-styles.ts
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- frontend/src/components/track-list/track-list.ts
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- frontend/src/components/queue-panel/queue-panel.ts
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- frontend/src/components/artists-view/artists-view.ts
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- frontend/src/components/genres-view/genres-view.ts
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- frontend/src/components/playlist-view/playlist-view.ts
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key-decisions:
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- "contain: strict on .main-panel (has explicit dimensions), layout style elsewhere (avoids breaking flex)"
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- "will-change: transform only on scroll containers (not :host) to avoid wasting GPU memory"
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- "content-visibility: auto on album cards with contain-intrinsic-size hint to prevent layout shift"
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patterns-established:
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- "CSS containment pattern: :host gets contain: layout style; scroll container gets contain: paint + will-change: transform"
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- "content-visibility: auto with contain-intrinsic-size for cards in virtualized grids"
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requirements-completed: [PERF-SCROLL-01, PERF-SCROLL-02]
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# Metrics
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duration: 3min
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completed: 2026-03-14
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---
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# Phase 14 Plan 01: CSS Containment & GPU Scroll Promotion Summary
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**CSS containment on app shell boundaries + GPU-composited scrolling on all 6 scroll-heavy components with content-visibility on album cards**
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## Performance
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- **Duration:** 3 min
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- **Started:** 2026-03-14T17:43:01Z
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- **Completed:** 2026-03-14T17:46:24Z
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- **Tasks:** 2
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- **Files modified:** 7
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## Accomplishments
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- App shell layout boundaries (content-area, main-panel, sidebar, bottom-bar) isolated with CSS containment to prevent cross-boundary layout recalculation
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- All 6 scroll-heavy components (cover-grid, track-list, queue-panel, artists-view, genres-view, playlist-view) now have CSS containment on :host and GPU layer promotion on scroll containers
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- Album cards skip rendering when off-screen via content-visibility: auto with intrinsic size hints
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Add CSS containment to app shell layout boundaries** - `efa06f7` (perf)
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2. **Task 2: Add GPU promotion and containment to all scroll containers** - `ac8a52e` (perf)
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## Files Created/Modified
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- `frontend/index.css` - CSS containment on .content-area, .main-panel, .main-panel > *, sidebar, .bottom-bar
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- `frontend/src/components/cover-grid/cover-grid-styles.ts` - contain + will-change on scroll container, content-visibility on album cards
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- `frontend/src/components/track-list/track-list.ts` - contain on :host, contain + will-change on lit-virtualizer
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- `frontend/src/components/queue-panel/queue-panel.ts` - contain on :host, contain + will-change on lit-virtualizer
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- `frontend/src/components/artists-view/artists-view.ts` - contain on :host, contain + will-change on grid scroll container
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- `frontend/src/components/genres-view/genres-view.ts` - contain on :host, contain + will-change on grid scroll container
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- `frontend/src/components/playlist-view/playlist-view.ts` - contain on :host, contain + will-change on playlist-list
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## Decisions Made
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- Used `contain: strict` only on `.main-panel` (has explicit flex: 1 + overflow: hidden), used `contain: layout style` elsewhere to avoid breaking flex layouts
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- Applied `will-change: transform` only to actual scroll containers (not :host elements) to avoid wasting GPU memory on non-scrolling elements
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- Added `content-visibility: auto` with `contain-intrinsic-size` hints on album cards to prevent layout shift during scroll
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## Deviations from Plan
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None - plan executed exactly as written.
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## Issues Encountered
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None
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## User Setup Required
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None - no external service configuration required.
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## Next Phase Readiness
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- CSS containment foundation in place for all components
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- Ready for Plan 02 (next performance optimization plan in phase 14)
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---
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*Phase: 14-performance-optimization*
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*Completed: 2026-03-14*
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## Self-Check: PASSED
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