chess/docs/review/performance-report.md

Performance Report - Chess Game Implementation

Report Date: 2025-11-22 Reviewer: Reviewer Agent (Performance Analysis) Swarm ID: swarm-chess-game Status: ❌ CANNOT ASSESS - NO IMPLEMENTATION

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Executive Summary

CRITICAL: Performance analysis cannot be performed because no implementation exists.

Performance Metrics Status:

• Lighthouse Score: ❌ N/A - No app to test
• Bundle Size: ❌ N/A - No build
• Rendering Performance: ❌ N/A - No UI
• Move Validation Speed: ❌ N/A - No game logic
• Browser Compatibility: ❌ N/A - No code

Overall Performance Rating: 0/10 - CANNOT MEASURE

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1. Lighthouse Performance Analysis

1.1 Desktop Performance

Target: Lighthouse Score >90

Metrics:

• Performance: >90
• Accessibility: >90
• Best Practices: >90
• SEO: >90

Actual: ❌ CANNOT MEASURE - No HTML page exists

Status: ❌ BLOCKED

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1.2 Mobile Performance

Target: Lighthouse Score >85 (mobile)

Metrics:

• Performance: >85
• First Contentful Paint: <1.8s
• Largest Contentful Paint: <2.5s
• Time to Interactive: <3.8s
• Cumulative Layout Shift: <0.1

Actual: ❌ CANNOT MEASURE

Status: ❌ BLOCKED

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2. Bundle Size Analysis

2.1 JavaScript Bundle

Target: <150KB gzipped

Expected Breakdown:

Total Bundle: 120KB (gzipped)
├── Core Game Logic: 45KB
│   ├── Models: 15KB
│   ├── Controllers: 12KB
│   ├── Views: 10KB
│   └── Utils: 8KB
├── Move Validation Engine: 35KB
├── UI Components: 25KB
├── AI Engine (Optional): 40KB
└── Dependencies: 15KB

Actual: ❌ NO BUILD - Cannot measure

Status: ❌ BLOCKED

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2.2 Asset Size

Target: <50KB total

Expected Assets:

• Piece images (SVG): 12 pieces × 2KB = 24KB
• Sound effects: 5 files × 3KB = 15KB
• CSS: ~10KB
• Total: ~49KB

Actual: ❌ NO ASSETS - Cannot measure

Status: ❌ BLOCKED

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3. Runtime Performance

3.1 Move Validation Speed

Target: <100ms per move validation

Test Scenarios:

• Simple pawn move: <10ms
• Knight move: <15ms
• Complex queen move: <30ms
• Check detection: <50ms
• Checkmate detection: <100ms
• Position evaluation (AI): <200ms

Actual: ❌ NO IMPLEMENTATION - Cannot measure

Status: ❌ BLOCKED

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3.2 Rendering Performance

Target: 60 FPS (16.67ms per frame)

Test Scenarios:

• Board initial render: <50ms
• Piece movement animation: 60 FPS
• Highlight updates: <16ms
• Move history scroll: 60 FPS
• Simultaneous animations: 60 FPS

Actual: ❌ NO UI - Cannot measure

Status: ❌ BLOCKED

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3.3 Memory Usage

Target: <100MB RAM usage

Expected Memory Profile:

• Game state: ~2MB
• Board representation: ~1MB
• Move history (100 moves): ~5MB
• UI elements: ~10MB
• Total baseline: ~20MB

Actual: ❌ NO APP - Cannot measure

Status: ❌ BLOCKED

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4. Browser Compatibility Matrix

4.1 Desktop Browsers

Target: 100% compatibility on modern browsers

Browser	Version	Status	Performance	Notes
Chrome	Latest	❌ N/A	❌ N/A	Not tested
Firefox	Latest	❌ N/A	❌ N/A	Not tested
Safari	Latest	❌ N/A	❌ N/A	Not tested
Edge	Latest	❌ N/A	❌ N/A	Not tested
Opera	Latest	❌ N/A	❌ N/A	Not tested

Status: ❌ NO TESTS RUN

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4.2 Mobile Browsers

Target: 100% compatibility on iOS Safari and Chrome Android

Browser	Platform	Status	Performance	Notes
Safari	iOS 15+	❌ N/A	❌ N/A	Not tested
Chrome	Android 10+	❌ N/A	❌ N/A	Not tested
Firefox	Android	❌ N/A	❌ N/A	Not tested
Samsung Browser	Android	❌ N/A	❌ N/A	Not tested

Status: ❌ NO TESTS RUN

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4.3 Feature Support

Target: All ES6+ features supported with polyfills if needed

Feature	Chrome	Firefox	Safari	Edge	Polyfill Needed
ES6 Classes	❌ N/A	❌ N/A	❌ N/A	❌ N/A	N/A
Arrow Functions	❌ N/A	❌ N/A	❌ N/A	❌ N/A	N/A
Destructuring	❌ N/A	❌ N/A	❌ N/A	❌ N/A	N/A
Template Literals	❌ N/A	❌ N/A	❌ N/A	❌ N/A	N/A
Promises	❌ N/A	❌ N/A	❌ N/A	❌ N/A	N/A
LocalStorage	❌ N/A	❌ N/A	❌ N/A	❌ N/A	N/A
Drag & Drop API	❌ N/A	❌ N/A	❌ N/A	❌ N/A	N/A

Status: ❌ CANNOT TEST

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5. Responsive Design Performance

5.1 Viewport Testing

Target: Smooth performance at all viewport sizes

Viewport	Size	Performance	Layout	Notes
Mobile Portrait	320×568	❌ N/A	❌ N/A	Not tested
Mobile Landscape	568×320	❌ N/A	❌ N/A	Not tested
Tablet Portrait	768×1024	❌ N/A	❌ N/A	Not tested
Tablet Landscape	1024×768	❌ N/A	❌ N/A	Not tested
Desktop Small	1280×720	❌ N/A	❌ N/A	Not tested
Desktop Large	1920×1080	❌ N/A	❌ N/A	Not tested
4K	2560×1440	❌ N/A	❌ N/A	Not tested

Status: ❌ NO UI TO TEST

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6. Network Performance

6.1 Load Time Analysis

Target: <2s on 3G, <1s on 4G

Metrics:

• Initial HTML: <100ms
• CSS load: <200ms
• JS load: <500ms
• Assets load: <300ms
• Total time to interactive: <1s (4G), <2s (3G)

Actual: ❌ NO APP TO TEST

Status: ❌ BLOCKED

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6.2 Caching Strategy

Expected:

• Service Worker implemented
• Static assets cached
• App Shell cached
• Offline fallback available

Actual: ❌ NOT IMPLEMENTED

Status: ❌ BLOCKED

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7. Optimization Opportunities (For Future Implementation)

7.1 Code Optimizations

Recommended Optimizations:

1. Bitboards for Position Checking

// Instead of array iteration
// Use bitboards for O(1) position checks
class BitboardOptimizer {
  // Fast position checking
  // ~10x faster than array iteration
}

2. Move Caching

// Cache valid moves for current position
// Invalidate on position change
class MoveCache {
  // Reduce redundant calculations
  // ~5x speedup for AI
}

3. Lazy Loading

// Load AI engine only when needed
// Reduce initial bundle size
const AIEngine = () => import('./ai/AIEngine.js');

4. Virtual Scrolling for History

// Only render visible moves
// Handle 1000+ moves smoothly
class VirtualMoveHistory {
  // Constant memory usage
}

Status: ⚠️ RECOMMENDATIONS ONLY - No implementation to optimize

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7.2 Rendering Optimizations

Recommended:

1. RequestAnimationFrame for Animations

// Smooth 60 FPS animations
function animatePieceMove(piece, from, to) {
  requestAnimationFrame(updatePosition);
}

2. CSS Transforms for Movement

/* Hardware-accelerated animations */
.piece {
  transform: translate3d(x, y, 0);
  will-change: transform;
}

3. Debounced Window Resize

// Prevent excessive reflows
const handleResize = debounce(() => {
  resizeBoard();
}, 100);

Status: ⚠️ RECOMMENDATIONS ONLY

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7.3 Memory Optimizations

Recommended:

1. Object Pooling for Positions

// Reuse position objects
// Reduce GC pressure
class PositionPool {
  // ~50% memory reduction
}

2. Efficient Move History

// Store deltas instead of full positions
class CompressedHistory {
  // ~80% memory reduction
}

Status: ⚠️ RECOMMENDATIONS ONLY

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8. Performance Benchmarks (Cannot Run)

8.1 Expected Benchmarks

Core Operations (Expected performance):

• Board initialization: <10ms
• Piece creation: <1ms per piece
• Move validation: <50ms
• Legal moves generation: <30ms
• Check detection: <20ms
• Checkmate detection: <100ms
• Position evaluation: <200ms

UI Operations (Expected performance):

• Initial render: <50ms
• Piece selection: <5ms
• Move highlight: <10ms
• Animation frame: <16ms (60 FPS)
• History update: <20ms

Actual Benchmarks: ❌ CANNOT RUN - No implementation

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8.2 AI Performance (If Implemented)

Expected AI Performance:

• Depth 1 search: <50ms
• Depth 2 search: <200ms
• Depth 3 search: <1000ms
• Depth 4 search: <5000ms
• Depth 5 search: <30000ms

Optimizations:

• Alpha-beta pruning: ~10x speedup
• Move ordering: ~2x speedup
• Transposition table: ~3x speedup
• Web Worker: No UI blocking

Actual Performance: ❌ NO AI IMPLEMENTED

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9. Critical Performance Issues (None Found - No Code)

No Issues Detected

Reason: No implementation exists to analyze for performance issues.

Potential Issues to Watch For (during implementation):

1. N+1 Query Problem in Move Validation

// ❌ BAD: Checking each square individually
for (let square of allSquares) {
  if (isPieceAt(square)) { /* ... */ }
}

// ✅ GOOD: Single position lookup
const positions = getPiecePositions(); // O(1) lookup

2. Unnecessary Re-renders

// ❌ BAD: Re-rendering entire board on every move
function updateBoard() {
  renderEntireBoard(); // Slow
}

// ✅ GOOD: Update only changed squares
function updateBoard(move) {
  updateSquare(move.from);
  updateSquare(move.to);
}

3. Memory Leaks in Event Listeners

// ❌ BAD: Not removing listeners
squares.forEach(sq => {
  sq.addEventListener('click', handler);
});

// ✅ GOOD: Clean up on destroy
class BoardView {
  destroy() {
    this.squares.forEach(sq => {
      sq.removeEventListener('click', this.handler);
    });
  }
}

---

10. Performance Testing Plan

10.1 Automated Performance Tests

To Implement:

// Lighthouse CI Configuration
module.exports = {
  ci: {
    collect: {
      numberOfRuns: 3,
      url: ['http://localhost:8080']
    },
    assert: {
      assertions: {
        'categories:performance': ['error', { minScore: 0.9 }],
        'categories:accessibility': ['error', { minScore: 0.9 }],
        'categories:best-practices': ['error', { minScore: 0.9 }]
      }
    }
  }
};

Status: ❌ NOT CONFIGURED

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10.2 Manual Performance Tests

Test Scenarios:

1. Load time on 3G connection
2. 60 FPS animation smoothness
3. Memory usage during 100-move game
4. AI response time at different difficulty levels
5. Rapid piece movements (stress test)
6. Multiple tabs open (memory leak test)

Status: ❌ CANNOT TEST - No app

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11. Performance Recommendations for Implementation

Phase 1: MVP (Focus on Correctness)

• ✅ Implement clean, readable code
• ✅ Don't optimize prematurely
• ✅ Get features working first
• ⚠️ Measure baseline performance

Phase 2: Optimization (After MVP Works)

• ✅ Profile with Chrome DevTools
• ✅ Identify bottlenecks
• ✅ Optimize hot paths
• ✅ Implement caching where beneficial

Phase 3: Polish (Final optimizations)

• ✅ Code splitting
• ✅ Lazy loading
• ✅ Bundle optimization
• ✅ Service Worker caching

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12. Performance Monitoring Setup

12.1 Recommended Tools

Development:

• Chrome DevTools Performance Panel
• React DevTools Profiler (if using React)
• Lighthouse
• WebPageTest

Production:

• Google Analytics Performance
• Real User Monitoring (RUM)
• Error tracking (Sentry)

Status: ❌ NOT CONFIGURED

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12.2 Performance Metrics Dashboard

Key Metrics to Track:

• Page load time (p50, p95, p99)
• Time to interactive
• Bundle size over time
• Core Web Vitals (LCP, FID, CLS)
• API response times
• Error rates

Status: ❌ NOT IMPLEMENTED

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13. Verdict

Performance Rating: 0/10 - CANNOT ASSESS

Reason: No implementation exists to analyze.

Status: ❌ BLOCKED - IMPLEMENTATION REQUIRED

Recommendation:

1. Complete implementation first
2. Run Lighthouse audits
3. Measure bundle size
4. Test browser compatibility
5. Benchmark core operations
6. Optimize based on real data

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14. Performance Checklist (For Future Implementation)

Build Performance

• Bundle size <150KB gzipped
• Code splitting implemented
• Tree shaking enabled
• Minification enabled
• Compression (gzip/brotli) configured

Runtime Performance

• Move validation <100ms
• 60 FPS rendering maintained
• No memory leaks
• Efficient event handling
• Lazy loading for AI

Network Performance

• Load time <2s (3G)
• Service Worker caching
• Asset optimization
• CDN for static assets

Browser Compatibility

• Chrome (latest) - 100% functional
• Firefox (latest) - 100% functional
• Safari (latest) - 100% functional
• Edge (latest) - 100% functional
• Mobile browsers tested

Accessibility Performance

• Keyboard navigation smooth
• Screen reader performant
• High contrast mode supported
• Reduced motion respected

Current Status: 0/25 items completed (0%)

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15. Sign-Off

Performance Analyst: Reviewer Agent Analysis Type: Performance & Compatibility Review Status: ❌ CANNOT COMPLETE - NO IMPLEMENTATION Date: 2025-11-22

Critical Finding: Performance analysis cannot be performed without an implementation. All performance metrics, benchmarks, and compatibility tests are blocked until code is written.

Action Required: Complete implementation, then re-run this performance analysis.

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FINAL VERDICT: ❌ IMPLEMENTATION REQUIRED - PERFORMANCE ANALYSIS BLOCKED

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Appendix A: Performance Budget

Recommended Performance Budget

For implementation team to follow:

{
  "budget": {
    "javascript": {
      "total": 150,
      "vendor": 50,
      "app": 100
    },
    "css": {
      "total": 30
    },
    "images": {
      "total": 50
    },
    "fonts": {
      "total": 20
    }
  },
  "metrics": {
    "loadTime": {
      "3g": 2000,
      "4g": 1000
    },
    "fps": 60,
    "lighthouse": {
      "performance": 90,
      "accessibility": 90,
      "bestPractices": 90
    }
  }
}

All values in KB (except loadTime in ms, fps, and lighthouse scores).