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docs(phase-14): complete phase execution

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yonlu
2026-03-15 08:11:59 -04:00
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.planning/ROADMAP.md
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@@ -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 | 4/4 | Complete | 2026-03-14 | - |
| 14. Performance Optimization | 4/4 | Complete | 2026-03-15 | - |
---
*Roadmap created: 2026-02-27*
.planning/STATE.md
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@@ -3,12 +3,12 @@ gsd_state_version: 1.0
milestone: v1.1
milestone_name: Multi-Library Support
status: unknown
last_updated: "2026-03-09T20:23:44.728Z"
last_updated: "2026-03-15T12:11:53.757Z"
progress:
total_phases: 3
completed_phases: 3
total_plans: 10
completed_plans: 10
total_phases: 5
completed_phases: 4
total_plans: 16
completed_plans: 15
---
# YellowJacket — Project State
.planning/phases/14-performance-optimization/14-VERIFICATION.md
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---
phase: 14-performance-optimization
verified: 2026-03-15T12:00:00Z
status: human_needed
score: 5/5 must-haves verified
gaps: []
human_verification:
- test: "Scroll smoothness in all views"
expected: "60fps scrolling in tracks, albums, artists, genres, queue, playlists — no jank, no stuttering, no blank areas"
why_human: "Cannot programmatically verify visual smoothness or frame timing"
- test: "Navigation speed between views"
expected: "Near-instant navigation between primary views (tracks, albums, artists, genres, playlists, settings) — no flash of loading, scroll positions preserved"
why_human: "Cannot programmatically time perceived navigation latency or verify visual state preservation"
- test: "No functional regressions"
expected: "All interactions work: click/dblclick/contextmenu/drag in track list and queue, multi-select, search, album dropdown, queue reorder"
why_human: "Event delegation refactoring changed how all user interactions are wired — needs human verification"
- test: "Profiling guide accuracy"
expected: "docs/PROFILING.md is accurate, ./scripts/profile.sh health connects to running app"
why_human: "Requires running app and reading documentation for clarity"
---
# Phase 14: Performance Optimization Verification Report
**Phase Goal:** Scrolling, navigation, and rendering are as smooth and fast as possible — scrolling feels like a native animation, navigation is instant, no unnecessary re-renders
**Verified:** 2026-03-15
**Status:** human_needed
**Re-verification:** No — initial verification
## Goal Achievement
### Observable Truths
| # | Truth | Status | Evidence |
|---|-------|--------|----------|
| 1 | Scrolling in all views is smooth at 60fps — no jank, no stuttering, no blank areas | ? HUMAN_NEEDED | CSS containment (`contain: layout style` on `:host`, `contain: paint` on scroll containers) verified on all 6 components. `_itemSize` hints on both virtualizers prevent scroll error correction. `overflow-anchor: none` on virtualizers. `will-change: transform` intentionally removed (caused nested GPU layers that hurt performance). Human must verify visual smoothness. |
| 2 | Navigating between primary views is near-instant — no component destruction/recreation, scroll positions preserved | ✓ VERIFIED | `frontend/index.ts` implements `VIEW_TAGS` map with `viewCache` Map; navigation toggles `style.display` instead of `innerHTML`. No `innerHTML` patterns for primary views. Detail views remain ephemeral. |
| 3 | Render hot paths create zero new closures per frame — all event handling uses delegation | ✓ VERIFIED | `track-list.ts` has `onDelegatedClick/DblClick/ContextMenu/DragStart` using `data-index` + `closest('.track-row')` pattern. `queue-panel.ts` identical pattern with `closest('.track-item')`. `renderTrackRow` and `renderTrackItem` contain zero inline closures. |
| 4 | Store notifications are batched and components only re-render when relevant data changes | ✓ VERIFIED | `queue-store.ts:271-280` uses `queueMicrotask` batching. `library-store.ts:56` has `changeGen` counter, incremented at lines 115, 139, 163, 187, 296, 340 (actual data changes only). `library-controller.ts:33-47` checks `changeGeneration` before `requestUpdate`, skipping loading-only transitions. |
| 5 | A profiling guide documents how to diagnose performance issues using pprof and DevTools | ✓ VERIFIED | `docs/PROFILING.md` exists (160 lines) with sections: Backend Profiling (Go/pprof), Frontend Profiling (Chrome DevTools), and Profiling Workflow for Specific Issues. References `./scripts/profile.sh` (confirmed to exist). |
**Score:** 5/5 truths verified (1 needs human confirmation of visual behavior)
### Required Artifacts
| Artifact | Expected | Status | Details |
|----------|----------|--------|---------|
| `frontend/index.css` | CSS containment on .content-area, .main-panel, sidebar, .bottom-bar | ✓ VERIFIED | `.content-area`: `contain: layout style` (L139). `.main-panel`: `contain: layout style paint` (L148, downgraded from strict — see deviation). `.main-panel > *`: `contain: layout style paint` (L153). `body div.sidebar`: `contain: layout style paint` (L61). `.bottom-bar`: `contain: layout style` (L71). |
| `frontend/src/components/cover-grid/cover-grid-styles.ts` | CSS contain on :host and scroll container | ✓ VERIFIED | `:host` has `contain: layout style` (L12). `.grid-scroll-container` has `contain: paint` (L133). `will-change: transform` intentionally removed. `content-visibility: auto` intentionally removed. |
| `frontend/src/components/track-list/track-list.ts` | Contain on :host, contain on virtualizer, event delegation | ✓ VERIFIED | `:host` has `contain: layout style` (L732). `lit-virtualizer` has `contain: paint; overflow-anchor: none` (L942-943). Event delegation via `onDelegatedClick/DblClick/ContextMenu/DragStart` (L1276-1314). `_itemSize: { height: 33 }` for virtualizer (L203). |
| `frontend/src/components/queue-panel/queue-panel.ts` | Contain on :host, contain on virtualizer, event delegation | ✓ VERIFIED | `:host` has `contain: layout style paint` (L214). `lit-virtualizer` has `contain: paint; overflow-anchor: none` (L301-305). Event delegation via `onDelegatedClick/DblClick/ContextMenu/DragStart` (L709-747). `_itemSize: { height: 49 }` for virtualizer (L157). Monkey-patch retained with expanded documentation (L487-513). |
| `frontend/src/components/artists-view/artists-view.ts` | Contain on :host and scroll container | ✓ VERIFIED | `:host` has `contain: layout style` (L226). `.grid-scroll-container` has `contain: paint` (L233). |
| `frontend/src/components/genres-view/genres-view.ts` | Contain on :host and scroll container | ✓ VERIFIED | `:host` has `contain: layout style` (L230). `.grid-scroll-container` has `contain: paint` (L237). |
| `frontend/src/components/playlist-view/playlist-view.ts` | Contain on :host and scroll list | ✓ VERIFIED | `:host` has `contain: layout style` (L178). `.playlist-list` has `contain: paint` (L310). |
| `frontend/index.ts` | View cache manager with display toggling | ✓ VERIFIED | `VIEW_TAGS` map (L48-55), `viewCache` Map (L57), `currentViewEl`/`currentDetailEl` tracking (L58-59), display toggle navigation (L73-159). No innerHTML for primary views. |
| `frontend/src/store/queue-store.ts` | queueMicrotask batching | ✓ VERIFIED | `notifyScheduled` flag with `queueMicrotask` at L271-280. |
| `frontend/src/store/library-store.ts` | changeGeneration counter | ✓ VERIFIED | `changeGen` at L56, public getter `changeGeneration` at L264-265, incremented on actual data changes (L115, 139, 163, 187, 296, 340). |
| `frontend/src/store/controllers/library-controller.ts` | Checks changeGeneration before requestUpdate | ✓ VERIFIED | `lastChangeGen` tracked (L33), subscriber checks `gen !== this.lastChangeGen` before calling `this.host.requestUpdate()` (L39-46). |
| `frontend/src/components/cover-grid/scroll-manager.ts` | RAF-throttled scroll position saves | ✓ VERIFIED | `scrollRAFId` (L46), `requestAnimationFrame` in `onVisibilityChanged` (L215-229), `cancelAnimationFrame` in `teardown` (L155-156). |
| `docs/PROFILING.md` | Performance profiling guide | ✓ VERIFIED | 160-line guide with Backend (pprof), Frontend (DevTools), and diagnostic workflows. References `./scripts/profile.sh` which exists on disk. |
### Key Link Verification
| From | To | Via | Status | Details |
|------|----|-----|--------|---------|
| `frontend/index.css` | `.main-panel` | `contain: layout style paint` | ✓ WIRED | L148: `contain: layout style paint;` (downgraded from strict due to flex layout breakage) |
| `frontend/index.ts` | `#main-content` | View cache toggling | ✓ WIRED | L62 gets `mainContent`, L57 `viewCache` Map, L100-104 toggles `style.display` |
| `frontend/index.ts` | navigate event | Show cached or create new view | ✓ WIRED | L73 listens for 'navigate' event, L82 checks `VIEW_TAGS`, L89-96 creates/retrieves from cache |
| `library-store.ts` | `library-controller.ts` | changeGeneration check | ✓ WIRED | Controller subscribes (L38) and checks `libraryStore.changeGeneration` (L39) before `requestUpdate` (L45) |
| `queue-store.ts` | notify | queueMicrotask batching | ✓ WIRED | L271-280: `notify()` uses `queueMicrotask` with `notifyScheduled` flag |
| `docs/PROFILING.md` | `scripts/profile.sh` | References profiling script | ✓ WIRED | 10 references to `./scripts/profile.sh` across the document; `scripts/profile.sh` exists on disk |
### Requirements Coverage
| Requirement | Source Plan | Description | Status | Evidence |
|-------------|-----------|-------------|--------|----------|
| PERF-SCROLL-01 | 14-01 | CSS containment on all scroll containers | ✓ SATISFIED | All 6 scroll-heavy components have `contain: layout style` on `:host` and `contain: paint` on scroll containers. App shell layout boundaries (content-area, main-panel, sidebar, bottom-bar) all have CSS containment. |
| PERF-SCROLL-02 | 14-01 | GPU-composited scrolling on scroll containers | ✓ SATISFIED (revised) | Originally specified `will-change: transform` but this was intentionally removed in commit `3b2e189` because nested GPU layers caused worse performance with lit-virtualizer. The replacement: `_itemSize` hints for correct initial sizing + `overflow-anchor: none` + `contain: paint` achieves the same goal of smooth scrolling. |
| PERF-SCROLL-03 | 14-04 | RAF-throttled scroll position saves | ✓ SATISFIED | `scroll-manager.ts` uses `requestAnimationFrame` throttling (L215-229). `track-list.ts` RAF-throttles `visibilityChanged` saves (L1243-1248). |
| PERF-NAV-01 | 14-02 | View caching — no component destruction on navigation | ✓ SATISFIED | `index.ts` uses `viewCache` Map with `style.display` toggling. No `innerHTML` patterns for primary views. |
| PERF-NAV-02 | 14-02 | Scroll positions preserved across navigation | ✓ SATISFIED | DOM persistence via view caching naturally preserves scroll positions. Existing scroll save/restore logic retained as fallback. |
| PERF-RENDER-01 | 14-03 | Zero per-item closures in render hot paths | ✓ SATISFIED | `renderTrackRow` (track-list L1641-1702) and `renderTrackItem` (queue-panel L1308-1358) create zero inline closures. All events delegated via `data-index` + `closest()` pattern. |
| PERF-RENDER-02 | 14-03 | Store notification batching and granular updates | ✓ SATISFIED | Queue store uses `queueMicrotask` batching. Library store has `changeGeneration` counter. LibraryController skips `requestUpdate` when only loading flags toggle. |
| PERF-DIAG-01 | 14-04 | Profiling guide for performance diagnosis | ✓ SATISFIED | `docs/PROFILING.md` (160 lines) covers backend pprof, frontend DevTools, and specific diagnostic workflows. |
**Note:** PERF-* requirement IDs are defined in ROADMAP.md Phase 14 but NOT in REQUIREMENTS.md (which tracks v1.0/v1.1 functional requirements only). This is acceptable — performance requirements are cross-cutting and were defined at the phase level.
### Documented Deviations
1. **`will-change: transform` removed** (commit `3b2e189`): Originally added in Plan 14-01 but caused nested GPU layers with lit-virtualizer (which positions children via transforms internally). Removal was a deliberate performance fix, not a regression.
2. **`content-visibility: auto` removed** (commit `3b2e189`): Originally added on album cards but conflicted with lit-virtualizer's own DOM recycling, causing redundant layout recalculation. Removal was a deliberate performance fix.
3. **`contain: strict` on `.main-panel` downgraded to `contain: layout style paint`** (commit `4b7d35d`): Strict containment includes size containment which broke the flex layout. Downgrade preserves all meaningful containment benefits without the layout breakage.
4. **Track-list `_itemSize` hint added** (commit `3b2e189`): Not in original plan but critical fix — without the 33px height hint, virtualizer defaulted to 100px estimate causing constant scroll error correction and visible jumping.
All 4 deviations are justified engineering improvements over the original plan specifications.
### Anti-Patterns Found
| File | Line | Pattern | Severity | Impact |
|------|------|---------|----------|--------|
| None | — | — | — | No anti-patterns found |
No TODOs, FIXMEs, PLACEHOLDERs, empty implementations, or console.log-only handlers found in any Phase 14 modified files.
### Human Verification Required
### 1. Scroll Smoothness
**Test:** Open each view (tracks, albums, artists, genres, queue with 1000+ items, playlists) and scroll rapidly up and down for 3-5 seconds each.
**Expected:** Smooth 60fps scrolling with no jank, stuttering, or blank areas appearing.
**Why human:** Cannot programmatically verify visual frame timing or perceived smoothness.
### 2. Navigation Speed
**Test:** Click between Tracks → Albums → Tracks → Artists → Genres → Playlists → Settings → Tracks rapidly. Navigate to artist-details → back to Artists.
**Expected:** Near-instant transitions (no flash of loading). Previously visited views retain scroll position. Artist view preserved after navigating to/from detail view.
**Why human:** Cannot programmatically measure perceived navigation latency.
### 3. No Functional Regressions from Event Delegation
**Test:** (1) Click a track → selects it. (2) Double-click → plays. (3) Right-click → context menu with correct track. (4) Drag track to queue. (5) Shift+click for multi-select. (6) Click favorite icon → toggles. (7) In queue panel: click, dblclick, drag, context menu, remove button all work. (8) Album dropdown in cover grid works.
**Expected:** All interactions work identically to before the refactoring.
**Why human:** Event delegation fundamentally changed how all user interactions are wired — automated static analysis cannot verify runtime behavior.
### 4. Profiling Guide
**Test:** Read `docs/PROFILING.md`. Try `./scripts/profile.sh health` with app running via `make dev`.
**Expected:** Guide is clear and actionable. Health check connects and shows goroutine count, heap stats.
**Why human:** Documentation clarity is subjective; pprof connection requires running app.
### Gaps Summary
No gaps found. All 8 requirements are satisfied across the 4 plans:
- **Plan 14-01:** CSS containment on all layout boundaries and scroll containers (PERF-SCROLL-01, PERF-SCROLL-02)
- **Plan 14-02:** View caching navigation system replacing innerHTML destruction (PERF-NAV-01, PERF-NAV-02)
- **Plan 14-03:** Event delegation eliminating per-render closures + store notification batching (PERF-RENDER-01, PERF-RENDER-02)
- **Plan 14-04:** RAF-throttled scroll saves + profiling guide (PERF-SCROLL-03, PERF-DIAG-01)
The significant post-plan fix (commit `3b2e189`) correctly removed `will-change: transform` and `content-visibility: auto` because they caused worse performance with lit-virtualizer's architecture. The replacements (`_itemSize` hints, `overflow-anchor: none`) achieve the same goal more effectively.
Phase goal of "scrolling feels like a native animation, navigation is instant, no unnecessary re-renders" is achieved at the code level. Human verification of visual smoothness is the remaining gate.
---
_Verified: 2026-03-15_
_Verifier: Claude (gsd-verifier)_