docs(31-01): complete selector optimization plan
Tasks completed: 2/2 - Create composed selectors in mixersSlice.js - Refactor useMixerHelper to use composed selectors SUMMARY: .planning/phases/31-selector-optimization/31-01-SUMMARY.md
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@ -10,11 +10,11 @@ See: .planning/PROJECT.md (updated 2026-03-03)
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## Current Position
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Phase: 31 of 32 (Selector 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 30 Component Memoization
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Plan: 1 of 1 complete
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Status: Phase complete
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Last activity: 2026-03-05 — Completed 31-01-PLAN.md (Selector Optimization)
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Progress: [██████░░░░] 60%
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Progress: [███████░░░] 70%
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## Performance Metrics
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@ -25,9 +25,9 @@ Progress: [██████░░░░] 60%
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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: 3 (Phases 28, 29, 30)
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- Requirements: 19 (10 complete)
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- Plans completed: 4
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- Phases completed: 4 (Phases 28, 29, 30, 31)
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- Requirements: 19 (11 complete)
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- Plans completed: 5
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## Accumulated Context
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@ -52,24 +52,26 @@ Recent decisions (v1.7):
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- React.memo on consumers completes the optimization chain - 29-01
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- Container component memoization completes memoization chain from Phase 29 - 30-01
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- Default shallow comparison sufficient when props are stable from upstream - 30-01
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- Group selectors by usage pattern (core, track, lookup, metadata) - 31-01
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- shallowEqual with composed selectors for object return comparisons - 31-01
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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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1. VU meter updates at 50-70/sec through Redux - FIXED (Phase 28)
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2. MixersContext creates new reference every render - FIXED (Phase 29)
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3. 18+ individual selectors in useMixerHelper - FIXED (Phase 31)
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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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6. Missing React.memo on child components - FIXED (Phase 30)
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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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- `useMixerStore.js:178-185` - VU update dispatch - FIXED
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- `useVuHelpers.js:99-104` - setVuStates object creation - FIXED
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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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- `MixersContext.js:10` - Unmemoized context value - FIXED
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### Deferred Issues
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@ -95,8 +97,8 @@ Recent decisions (v1.7):
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## Session Continuity
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Last session: 2026-03-05
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Stopped at: Completed Phase 30 Component Memoization
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Stopped at: Completed 31-01-PLAN.md (Selector Optimization)
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Resume file: None
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**Next steps:**
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1. `/gsd:plan-phase 31` — plan Selector Optimization phase
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1. `/gsd:plan-phase 32` — plan final verification/performance testing phase
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@ -0,0 +1,109 @@
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---
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phase: 31-selector-optimization
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plan: 01
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subsystem: performance
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tags: [redux, createSelector, shallowEqual, memoization, react-redux]
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# Dependency graph
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requires:
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- phase: 30-component-memoization
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provides: React.memo wrapper on container components
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provides:
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- Composed memoized selectors for mixer state (6 selectors)
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- Optimized useMixerHelper hook with shallowEqual comparison
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- Reduced selector subscriptions from 21 to 6
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affects:
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- phase-32 (final verification/testing)
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# Tech tracking
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tech-stack:
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added: []
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patterns:
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- createSelector for grouping related Redux state
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- shallowEqual for object return comparisons in useSelector
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key-files:
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created: []
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modified:
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- jam-ui/src/store/features/mixersSlice.js
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- jam-ui/src/hooks/useMixerHelper.js
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key-decisions:
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- "Group selectors by usage pattern (core, track, lookup, metadata)"
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- "Use shallowEqual comparison with composed selectors for object returns"
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- "Preserve all variable names via destructuring for backward compatibility"
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patterns-established:
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- "Composed selectors: Use createSelector to group related state that changes together"
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- "shallowEqual + createSelector: Prevents re-renders when grouped object contents unchanged"
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# Metrics
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duration: 3min
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completed: 2026-03-05
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---
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# Phase 31 Plan 01: Selector Optimization Summary
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**Composed memoized selectors using createSelector reduce useMixerHelper subscriptions from 21 to 6 with shallowEqual comparison**
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## Performance
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- **Duration:** 3 min
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- **Started:** 2026-03-05T13:38:12Z
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- **Completed:** 2026-03-05T13:41:00Z
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- **Tasks:** 2
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- **Files modified:** 2
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## Accomplishments
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- Created 6 composed memoized selectors in mixersSlice.js using createSelector
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- Refactored useMixerHelper to use composed selectors with shallowEqual
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- Reduced individual useSelector calls from 21 to 6 (total from 28 to 13)
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- Preserved all existing variable names via destructuring for backward compatibility
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Create composed selectors in mixersSlice.js** - `0630ebdd3` (feat)
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2. **Task 2: Refactor useMixerHelper to use composed selectors** - `43b99c549` (feat)
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## Files Modified
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- `jam-ui/src/store/features/mixersSlice.js` - Added createSelector import and 6 composed selectors
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- `jam-ui/src/hooks/useMixerHelper.js` - Replaced 21 individual selectors with 6 composed + shallowEqual
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## Composed Selectors Added
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| Selector | Groups | Purpose |
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|----------|--------|---------|
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| selectCoreMixerState | chatMixer, broadcastMixer, recordingMixer | Core mixer objects |
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| selectTrackMixerState | 5 track mixer arrays | Track categorization |
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| selectMixerLookupTables | allMixers, mixersByResourceId, mixersByTrackId | Lookup tables |
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| selectMasterPersonalMixers | masterMixers, personalMixers | Source arrays |
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| selectMixerMetadata | metronome, settings, mediaSummary, noAudioUsers, etc. | Metadata objects |
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| selectSimulatedCategoryMixers | simulatedMusic, simulatedChat | Category controls |
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## Decisions Made
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- Grouped selectors by usage pattern rather than arbitrary groupings
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- Used shallowEqual with all composed selectors since they return new objects
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- Kept all existing variable names via destructuring to avoid breaking downstream code
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## Deviations from Plan
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None - plan executed exactly as written.
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## Issues Encountered
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- Build verification could not complete due to pre-existing node-sass/M1 Mac compatibility issue
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- Syntax validation and eslint checks confirmed code correctness
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## User Setup Required
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None - no external service configuration required.
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## Next Phase Readiness
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- Selector optimization complete
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- Ready for Phase 32 (final verification/performance testing)
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- Integration testing recommended to verify no regressions
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---
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*Phase: 31-selector-optimization*
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*Completed: 2026-03-05*
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