# Roadmap: JamKazam Media Features Modernization

## Milestones

- v1.0 Media Players (Phases 1-4) - SHIPPED 2026-01-14
- v1.1 Music Session Chat (Phases 5-10) - SHIPPED 2026-01-27
- v1.2 Session Attachments (Phases 11-14) - SHIPPED 2026-02-07
- v1.3 Session Settings Tests (Phases 15-17) - SHIPPED 2026-02-08
- v1.4 Memory Leak Prevention (Phases 18-22) - SHIPPED 2026-02-10
- v1.5 Fix Session Recording (Phases 23-25) - 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

## Overview

v1.7 eliminates page freezes caused by excessive React re-renders. The primary culprits are VU meter updates (50-70/sec), unoptimized context providers, missing component memoization, and redundant state updates. Each phase targets a specific optimization category with measurable impact.

## Phases

- [x] **Phase 28: VU Meter Optimization** - External store + RAF batching for high-frequency VU updates ✓
- [x] **Phase 29: Context Optimization** - Memoize and split MixersContext to isolate update frequency ✓
- [x] **Phase 30: Component Memoization** - Apply React.memo to prevent cascade re-renders ✓
- ~~Phase 31: Selector Optimization~~ - REVERTED (caused VU/slider performance regression)
- ~~Phase 32: State Update Optimization~~ - REVERTED (caused VU/slider performance regression)

## Phase Details

### Phase 28: VU Meter Optimization
**Goal**: VU meter updates no longer trigger React reconciliation
**Depends on**: v1.6 complete
**Requirements**: VU-01, VU-02, VU-03
**Success Criteria** (what must be TRUE):
  1. VU data flows through external store, not Redux
  2. VU components use refs for direct DOM updates
  3. React DevTools Profiler shows 0 re-renders from VU updates
  4. Session screen remains responsive during 10+ minute session
**Plans**: 2 plans

Plans:
- [x] 28-01-PLAN.md — Create external VU store infrastructure (vuStore + useVuStore hook) ✓
- [x] 28-02-PLAN.md — Wire components to use external store with direct DOM updates ✓

### Phase 29: Context Optimization
**Goal**: Context changes only re-render components that use the changed data
**Depends on**: Phase 28 (VU separated from context)
**Requirements**: CTX-01, CTX-02, CTX-03
**Success Criteria** (what must be TRUE):
  1. MixersContext.Provider value is memoized
  2. VuContext separated from MixerConfigContext
  3. Volume slider change doesn't re-render VU meters
  4. VU update doesn't re-render volume sliders
**Plans**: 1 plan

Plans:
- [x] 29-01-PLAN.md — Memoize context providers (MixersContext, VuContext, GlobalContext) and wrap consumers with React.memo ✓

### Phase 30: Component Memoization
**Goal**: Child components don't re-render when parent re-renders with same props
**Depends on**: Phase 29 (context optimized)
**Requirements**: MEMO-01, MEMO-02, MEMO-03, MEMO-04
**Success Criteria** (what must be TRUE):
  1. JKSessionAudioInputs wrapped with React.memo
  2. JKSessionRemoteTracks wrapped with React.memo
  3. Track components only re-render when their specific track data changes
  4. React DevTools shows stable render counts for memoized components
**Plans**: 1 plan

Plans:
- [x] 30-01-PLAN.md — Wrap JKSessionAudioInputs and JKSessionRemoteTracks with React.memo ✓

### Phase 31: Selector Optimization — REVERTED
**Status**: Reverted on 2026-03-06
**Reason**: Composed selectors with shallowEqual caused VU meters to animate slowly and volume sliders to become unresponsive. The overhead of selector composition and object comparison blocked the main thread during high-frequency updates.

### Phase 32: State Update Optimization — REVERTED
**Status**: Reverted on 2026-03-06
**Reason**: Changes to JKSessionScreen.js and useSessionModel.js caused the same VU/slider performance regression. The combination of debounce changes and state colocation interfered with real-time UI responsiveness.

## Progress

**Execution Order:** Phase 28 first (highest impact), then 29-30 (depend on 28), then 31-32 (independent)

| Phase | Milestone | Plans Complete | Status | Completed |
|-------|-----------|----------------|--------|-----------|
| 28. VU Meter Optimization | v1.7 | 2/2 | ✓ Complete | 2026-03-05 |
| 29. Context Optimization | v1.7 | 1/1 | ✓ Complete | 2026-03-05 |
| 30. Component Memoization | v1.7 | 1/1 | ✓ Complete | 2026-03-05 |
| 31. Selector Optimization | v1.7 | - | ✗ Reverted | 2026-03-06 |
| 32. State Update Optimization | v1.7 | - | ✗ Reverted | 2026-03-06 |

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*v1.7 roadmap created 2026-03-03*
