98 lines
3.7 KiB
Markdown
98 lines
3.7 KiB
Markdown
# Project State
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## Project Reference
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See: .planning/PROJECT.md (updated 2026-03-03)
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**Core value:** Modernize session features from legacy jQuery/Rails to React patterns
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**Current focus:** v1.7 Performance Optimization - Eliminate page freezes from excessive re-renders
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## Current Position
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Phase: 29 of 32 (Context Optimization)
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Plan: Not started
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Status: Ready to plan
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Last activity: 2026-03-05 — Completed Phase 28 VU Meter Optimization
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Progress: [██░░░░░░░░] 20%
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## Performance Metrics
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**v1.0 - v1.6 Summary:**
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- Total milestones shipped: 7
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- Total phases completed: 27
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- Total plans completed: 49
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**v1.7 Performance Optimization (In Progress):**
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- Phases: 5 (phases 28-32)
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- Phases completed: 1 (Phase 28)
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- Requirements: 19 (3 complete)
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- Plans completed: 2
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## Accumulated Context
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### Decisions
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See PROJECT.md Key Decisions table for full history.
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Recent decisions (v1.7):
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- External VU store over Redux (50-70 updates/sec would overwhelm Redux) - 28-01
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- useSyncExternalStore shim for React 16 compatibility - 28-01
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- Dual hook API (useAllVuLevels and useVuLevel) for flexibility - 28-01
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- RAF batching centralized in store vs per-component - 28-01
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- Context splitting (separates high-frequency from low-frequency updates)
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- React.memo over PureComponent (functional components standard in codebase)
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- requestAnimationFrame batching (limits to 60fps, matches display refresh)
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- Route VU data directly to vuStore in bridge callback, bypassing React state - 28-02
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- Per-component RAF loops over centralized subscription system (simpler for multiple mixer IDs) - 28-02
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- React.memo on SessionTrackVU to prevent parent re-render propagation - 28-02
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- className assignment over classList.add/remove for DOM efficiency - 28-02
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### Investigation Findings (v1.7)
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**Root causes of page freezes:**
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1. VU meter updates at 50-70/sec through Redux
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2. MixersContext creates new reference every render
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3. 18+ individual selectors in useMixerHelper
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4. Triple track sync calls on session join
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5. Debounce instance recreation on dependency change
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6. Missing React.memo on child components
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**Hotspot files:**
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- `useMixerStore.js:178-185` - VU update dispatch
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- `useVuHelpers.js:99-104` - setVuStates object creation
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- `mixersSlice.js:145-165` - updateMixer creates new objects
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- `JKSessionScreen.js:463-475` - Triple track sync calls
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- `useSessionModel.js:605-614` - Debounced trackChanges
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- `MixersContext.js:10` - Unmemoized context value
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### Deferred Issues
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1. **End-of-track restart requires double-click** (Minor) - From v1.0
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2. **Loop functionality not working** (Medium) - From v1.0
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3. **Volume control not working in popup mode** (Medium) - From v1.0
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4. **WebSocket chat messages only broadcast to musicians** (Medium) - From v1.2
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5. **mp3 backend support** (Medium) - Frontend allows, backend whitelist doesn't support
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6. **Pre-existing test failures in JKChatMessageList.test.js** (Low) - Missing activeSession state
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7. **Duplicate recording start paths** (Low) - From v1.5
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### Roadmap Evolution
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- **v1.0 Media Players** (Phases 1-5): Shipped 2026-01-14
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- **v1.1 Music Session Chat** (Phases 6-11): Shipped 2026-01-31
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- **v1.2 Session Attachments** (Phases 12-16): Shipped 2026-02-07
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- **v1.3 Session Settings Tests** (Phases 17-18): Shipped 2026-02-08
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- **v1.4 Memory Leak Prevention** (Phases 19-23): Shipped 2026-02-10
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- **v1.5 Fix Session Recording** (Phases 24-25): Shipped 2026-02-25
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- **v1.6 Media Features Polish** (Phases 26-27): Shipped 2026-03-03
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- **v1.7 Performance Optimization** (Phases 28-32): In Progress
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## Session Continuity
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Last session: 2026-03-05
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Stopped at: Completed Phase 28 VU Meter Optimization
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Resume file: None
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**Next steps:**
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1. `/gsd:plan-phase 29` — plan Context Optimization phase
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