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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: 29 of 32 (Context Optimization) Plan: Not started Status: Ready to plan Last activity: 2026-03-05 — Completed Phase 28 VU Meter Optimization

Progress: [██░░░░░░░░] 20%

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: 1 (Phase 28)
  • Requirements: 19 (3 complete)
  • Plans completed: 2

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

Investigation Findings (v1.7)

Root causes of page freezes:

  1. VU meter updates at 50-70/sec through Redux
  2. MixersContext creates new reference every render
  3. 18+ individual selectors in useMixerHelper
  4. Triple track sync calls on session join
  5. Debounce instance recreation on dependency change
  6. 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

  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 28-32): In Progress

Session Continuity

Last session: 2026-03-05 Stopped at: Completed Phase 28 VU Meter Optimization Resume file: None

Next steps:

  1. /gsd:plan-phase 29 — plan Context Optimization phase