yonlu
ef18f59a9a
- 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)
104 lines
4.4 KiB
Markdown
104 lines
4.4 KiB
Markdown
---
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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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