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Project State

Project Reference

See: .planning/PROJECT.md (updated 2026-03-03)

Core value: Modernize session features from legacy jQuery/Rails to React patterns Current focus: v1.7 Performance Optimization - Eliminate page freezes from excessive re-renders

Current Position

Phase: 31 of 32 (Selector Optimization) Plan: Not started Status: Ready to plan Last activity: 2026-03-05 — Completed Phase 30 Component Memoization

Progress: [██████░░░░] 60%

Performance Metrics

v1.0 - v1.6 Summary:

Total milestones shipped: 7
Total phases completed: 27
Total plans completed: 49

v1.7 Performance Optimization (In Progress):

Phases: 5 (phases 28-32)
Phases completed: 3 (Phases 28, 29, 30)
Requirements: 19 (10 complete)
Plans completed: 4

Accumulated Context

Decisions

See PROJECT.md Key Decisions table for full history.

Recent decisions (v1.7):

External VU store over Redux (50-70 updates/sec would overwhelm Redux) - 28-01
useSyncExternalStore shim for React 16 compatibility - 28-01
Dual hook API (useAllVuLevels and useVuLevel) for flexibility - 28-01
RAF batching centralized in store vs per-component - 28-01
Context splitting (separates high-frequency from low-frequency updates)
React.memo over PureComponent (functional components standard in codebase)
requestAnimationFrame batching (limits to 60fps, matches display refresh)
Route VU data directly to vuStore in bridge callback, bypassing React state - 28-02
Per-component RAF loops over centralized subscription system (simpler for multiple mixer IDs) - 28-02
React.memo on SessionTrackVU to prevent parent re-render propagation - 28-02
className assignment over classList.add/remove for DOM efficiency - 28-02
getMixer stabilization via useCallback prevents cascade of function recreations - 29-01
Context value memoization only effective when hook functions are stable - 29-01
React.memo on consumers completes the optimization chain - 29-01
Container component memoization completes memoization chain from Phase 29 - 30-01
Default shallow comparison sufficient when props are stable from upstream - 30-01

Investigation Findings (v1.7)

Root causes of page freezes:

VU meter updates at 50-70/sec through Redux
MixersContext creates new reference every render
18+ individual selectors in useMixerHelper
Triple track sync calls on session join
Debounce instance recreation on dependency change
Missing React.memo on child components

Hotspot files:

useMixerStore.js:178-185 - VU update dispatch
useVuHelpers.js:99-104 - setVuStates object creation
mixersSlice.js:145-165 - updateMixer creates new objects
JKSessionScreen.js:463-475 - Triple track sync calls
useSessionModel.js:605-614 - Debounced trackChanges
MixersContext.js:10 - Unmemoized context value

Deferred Issues

End-of-track restart requires double-click (Minor) - From v1.0
Loop functionality not working (Medium) - From v1.0
Volume control not working in popup mode (Medium) - From v1.0
WebSocket chat messages only broadcast to musicians (Medium) - From v1.2
mp3 backend support (Medium) - Frontend allows, backend whitelist doesn't support
Pre-existing test failures in JKChatMessageList.test.js (Low) - Missing activeSession state
Duplicate recording start paths (Low) - From v1.5

Roadmap Evolution

v1.0 Media Players (Phases 1-5): Shipped 2026-01-14
v1.1 Music Session Chat (Phases 6-11): Shipped 2026-01-31
v1.2 Session Attachments (Phases 12-16): Shipped 2026-02-07
v1.3 Session Settings Tests (Phases 17-18): Shipped 2026-02-08
v1.4 Memory Leak Prevention (Phases 19-23): Shipped 2026-02-10
v1.5 Fix Session Recording (Phases 24-25): Shipped 2026-02-25
v1.6 Media Features Polish (Phases 26-27): Shipped 2026-03-03
v1.7 Performance Optimization (Phases 28-32): In Progress

Session Continuity

Last session: 2026-03-05 Stopped at: Completed Phase 30 Component Memoization Resume file: None

Next steps:

/gsd:plan-phase 31 — plan Selector Optimization phase

4.1 KiB Raw Blame History