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jam-cloud/.planning/STATE.md

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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: v1.7 Complete Plan: All stable phases complete (28, 29, 30) Status: Milestone shipped Last activity: 2026-03-06 — v1.7 shipped (Phases 31-32 reverted)

Progress: [██████████] 100%

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)
  • Phases reverted: 2 (Phases 31, 32 caused VU/slider perf regression)
  • Requirements: 19 (15 complete)
  • Plans completed: 7

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
  • Group selectors by usage pattern (core, track, lookup, metadata) - 31-01 - REVERTED
  • shallowEqual with composed selectors for object return comparisons - 31-01 - REVERTED
  • 1.5s debounce delay for track sync covers mixer initialization window - 32-01 - REVERTED
  • useDebounceCallback with ref pattern prevents stale closures - 32-01 - REVERTED
  • useMemo with empty deps creates stable debounced function - 32-01 - REVERTED
  • State colocation: Loading state lives in component that uses it - 32-03 - REVERTED
  • React.memo on self-contained button components prevents parent re-renders - 32-03 - REVERTED

Phase 31-32 Revert (2026-03-06):

  • Composed selectors with shallowEqual caused VU meters to animate slowly
  • Phase 32 changes caused volume sliders to be unresponsive
  • Root cause: likely blocking main thread during selector evaluation
  • Phases 28-30 optimizations remain effective and stable

Investigation Findings (v1.7)

Root causes of page freezes:

  1. VU meter updates at 50-70/sec through Redux - FIXED (Phase 28)
  2. MixersContext creates new reference every render - FIXED (Phase 29)
  3. 18+ individual selectors in useMixerHelper - REVERTED (Phase 31 caused perf regression)
  4. Triple track sync calls on session join - REVERTED (Phase 32 caused perf regression)
  5. Debounce instance recreation on dependency change - REVERTED (Phase 32 caused perf regression)
  6. Missing React.memo on child components - FIXED (Phase 30)
  7. Redundant mixer categorization dispatches - REVERTED (Phase 32 caused perf regression)
  8. Loading state in parent causing unnecessary re-renders - REVERTED (Phase 32 caused perf regression)

Hotspot files:

  • useMixerStore.js:178-185 - VU update dispatch - FIXED
  • useVuHelpers.js:99-104 - setVuStates object creation - FIXED
  • mixersSlice.js:145-165 - updateMixer creates new objects
  • JKSessionScreen.js:463-475 - Triple track sync calls - REVERTED
  • useSessionModel.js:605-614 - Debounced trackChanges - REVERTED
  • MixersContext.js:10 - Unmemoized context value - FIXED
  • useMixerHelper.js:291-295 - Unconditional category dispatches - REVERTED

Deferred Issues

  1. End-of-track restart requires double-click (Minor) - From v1.0
  2. Loop functionality not working (Medium) - From v1.0
  3. Volume control not working in popup mode (Medium) - From v1.0
  4. WebSocket chat messages only broadcast to musicians (Medium) - From v1.2
  5. mp3 backend support (Medium) - Frontend allows, backend whitelist doesn't support
  6. Pre-existing test failures in JKChatMessageList.test.js (Low) - Missing activeSession state
  7. 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 28-30): Shipped 2026-03-06

Session Continuity

Last session: 2026-03-06 Stopped at: v1.7 milestone shipped Resume file: None

Next steps:

  1. Merge fix_for_page_freeze branch to develop
  2. Plan v1.8 milestone if needed