armor-editor/docs/performance.md

Advanced rich text editor with premium armor-grade security, real-time collaboration, spell checking, track changes, and framework-agnostic design for React, Vue, Angular, Next.js, Nuxt.js

# Performance Optimization Guide

Optimize ArmorEditor for large documents, high traffic, and resource-constrained environments.

## Quick Setup

### Basic Performance
```javascript
const editor = new ArmorEditor({
  container: '#editor',
  performance: {
    virtualScrolling: true,
    lazyLoading: true,
    webWorkers: true
  }
});
```

## Virtual Scrolling

### Large Document Handling
```javascript
const editor = new ArmorEditor({
  virtualScrolling: {
    enabled: true,
    chunkSize: 1000,         // Lines per chunk
    bufferSize: 100,         // Buffer around viewport
    renderAhead: 50          // Pre-render lines
  }
});
```

### Virtual Scrolling Benefits
- Handle documents with 100,000+ lines
- Constant memory usage regardless of document size
- Smooth scrolling performance
- Instant loading of large files

### Configuration
```javascript
virtualScrolling: {
  enabled: true,
  chunkSize: 1000,           // Optimal: 500-2000
  bufferSize: 100,           // Optimal: 50-200
  renderAhead: 50,           // Optimal: 25-100
  recycleNodes: true,        // Reuse DOM nodes
  estimatedLineHeight: 20    // For better calculations
}
```

## Lazy Loading

### Content on Demand
```javascript
const editor = new ArmorEditor({
  lazyLoading: {
    enabled: true,
    images: true,             // Lazy load images
    media: true,              // Lazy load videos
    plugins: true,            // Lazy load plugins
    threshold: 0.1            // Load when 10% visible
  }
});
```

### Image Lazy Loading
```javascript
lazyLoading: {
  images: {
    enabled: true,
    placeholder: 'data:image/svg+xml;base64,...', // Placeholder
    fadeIn: true,             // Fade in effect
    retryAttempts: 3,         // Retry failed loads
    timeout: 5000             // Load timeout
  }
}
```

## Web Workers

### Background Processing
```javascript
const editor = new ArmorEditor({
  webWorkers: {
    enabled: true,
    maxWorkers: 4,            // Number of workers
    tasks: ['spellCheck', 'ai', 'encryption', 'export']
  }
});
```

### Worker Tasks
- **Spell checking** - Background grammar check
- **AI processing** - Content generation
- **Encryption** - Secure data processing
- **Export operations** - PDF/DOCX generation
- **Search indexing** - Full-text search

### Worker Configuration
```javascript
webWorkers: {
  enabled: true,
  maxWorkers: navigator.hardwareConcurrency || 4,
  tasks: {
    spellCheck: { worker: true, priority: 'low' },
    ai: { worker: true, priority: 'high' },
    encryption: { worker: true, priority: 'high' },
    export: { worker: true, priority: 'medium' }
  }
}
```

## Memory Management

### Efficient Memory Usage
```javascript
const editor = new ArmorEditor({
  memory: {
    autoCleanup: true,        // Auto cleanup unused objects
    gcInterval: 30000,        // Garbage collection interval
    maxCacheSize: '100MB',    // Maximum cache size
    imageCache: '50MB',       // Image cache limit
    undoLimit: 100            // Undo history limit
  }
});
```

### Memory Optimization
```javascript
memory: {
  autoCleanup: true,
  strategies: {
    weakReferences: true,     // Use WeakMap/WeakSet
    objectPooling: true,      // Reuse objects
    stringInterning: true,    // Deduplicate strings
    imageCompression: true    // Compress cached images
  }
}
```

## Network Optimization

### Efficient Data Transfer
```javascript
const editor = new ArmorEditor({
  network: {
    compression: true,        // Gzip/Brotli compression
    batchRequests: true,      // Batch API calls
    caching: 'aggressive',    // Cache strategy
    prefetch: true            // Prefetch resources
  }
});
```

### CDN Integration
```javascript
network: {
  cdn: {
    enabled: true,
    baseUrl: 'https://cdn.example.com',
    assets: ['fonts', 'icons', 'images'],
    fallback: true            // Fallback to local
  }
}
```

## Bundle Optimization

### Code Splitting
```javascript
const editor = new ArmorEditor({
  bundling: {
    codeSplitting: true,      // Split code by features
    treeshaking: true,        // Remove unused code
    minification: true,       // Minify code
    compression: 'brotli'     // Compression algorithm
  }
});
```

### Dynamic Imports
```javascript
// Load features on demand
const aiFeatures = await import('armor-editor/ai');
const collaboration = await import('armor-editor/collaboration');
const security = await import('armor-editor/security');

// Conditional loading
if (needsAI) {
  await editor.loadFeature('ai');
}
```

## Rendering Optimization

### Efficient Rendering
```javascript
const editor = new ArmorEditor({
  rendering: {
    requestAnimationFrame: true, // Use RAF for updates
    batchUpdates: true,          // Batch DOM updates
    debounceDelay: 16,           // 60fps debouncing
    useDocumentFragment: true    // Efficient DOM manipulation
  }
});
```

### GPU Acceleration
```javascript
rendering: {
  gpu: {
    enabled: true,
    css3d: true,              // CSS 3D transforms
    webgl: true,              // WebGL acceleration
    canvas: 'gpu'             // GPU-accelerated canvas
  }
}
```

## Caching Strategies

### Multi-Level Caching
```javascript
const editor = new ArmorEditor({
  caching: {
    levels: {
      memory: {
        enabled: true,
        maxSize: '50MB',
        ttl: 3600               // 1 hour
      },
      localStorage: {
        enabled: true,
        maxSize: '100MB',
        ttl: 86400              // 24 hours
      },
      indexedDB: {
        enabled: true,
        maxSize: '500MB',
        ttl: 604800             // 7 days
      }
    }
  }
});
```

### Cache Strategies
```javascript
caching: {
  strategies: {
    documents: 'lru',         // Least Recently Used
    images: 'lfu',            // Least Frequently Used
    fonts: 'persistent',      // Never expire
    api: 'ttl'               // Time To Live
  }
}
```

## Performance Monitoring

### Real-time Metrics
```javascript
const editor = new ArmorEditor({
  monitoring: {
    enabled: true,
    metrics: ['fps', 'memory', 'network', 'rendering'],
    alerts: {
      lowFPS: 30,             // Alert if FPS < 30
      highMemory: '200MB',    // Alert if memory > 200MB
      slowNetwork: 1000       // Alert if request > 1s
    }
  }
});
```

### Performance Events
```javascript
// Monitor performance
editor.on('performanceMetric', (metric) => {
  console.log(`${metric.name}: ${metric.value}`);
});

editor.on('performanceAlert', (alert) => {
  console.warn(`Performance alert: ${alert.type}`);
});

// Get current metrics
const metrics = editor.getPerformanceMetrics();
console.log('FPS:', metrics.fps);
console.log('Memory:', metrics.memory);
```

## Use Cases

### Large Document Editor
```javascript
const largeDocEditor = new ArmorEditor({
  container: '#large-doc',
  
  // Virtual scrolling for 100k+ lines
  virtualScrolling: {
    enabled: true,
    chunkSize: 2000,
    bufferSize: 200
  },
  
  // Lazy loading for media
  lazyLoading: {
    enabled: true,
    images: true,
    media: true
  },
  
  // Background processing
  webWorkers: {
    enabled: true,
    maxWorkers: 6,
    tasks: ['spellCheck', 'search', 'export']
  },
  
  // Memory management
  memory: {
    autoCleanup: true,
    maxCacheSize: '200MB',
    undoLimit: 50
  }
});
```

### High-Traffic Application
```javascript
const highTrafficEditor = new ArmorEditor({
  container: '#traffic-editor',
  
  // Network optimization
  network: {
    compression: true,
    batchRequests: true,
    caching: 'aggressive',
    cdn: {
      enabled: true,
      baseUrl: 'https://cdn.example.com'
    }
  },
  
  // Bundle optimization
  bundling: {
    codeSplitting: true,
    treeshaking: true,
    compression: 'brotli'
  },
  
  // Caching
  caching: {
    levels: {
      memory: { maxSize: '100MB' },
      localStorage: { maxSize: '200MB' },
      indexedDB: { maxSize: '1GB' }
    }
  }
});
```

### Mobile-Optimized Editor
```javascript
const mobileEditor = new ArmorEditor({
  container: '#mobile-editor',
  
  // Reduced resource usage
  performance: {
    virtualScrolling: true,
    lazyLoading: true,
    webWorkers: false        // Limited on mobile
  },
  
  // Memory constraints
  memory: {
    maxCacheSize: '25MB',
    imageCache: '10MB',
    undoLimit: 25
  },
  
  // Network optimization
  network: {
    compression: true,
    prefetch: false,         // Save bandwidth
    caching: 'conservative'
  },
  
  // Rendering optimization
  rendering: {
    gpu: { enabled: false }, // Battery saving
    debounceDelay: 32       // 30fps for battery
  }
});
```

## Benchmarking

### Performance Testing
```javascript
// Benchmark editor performance
const benchmark = editor.createBenchmark({
  tests: [
    'document_load',
    'typing_performance',
    'scroll_performance',
    'memory_usage'
  ],
  iterations: 100,
  warmup: 10
});

const results = await benchmark.run();
console.log('Results:', results);
```

### Load Testing
```javascript
// Simulate high load
const loadTest = editor.createLoadTest({
  concurrentUsers: 100,
  duration: 300,           // 5 minutes
  operations: [
    'type_text',
    'format_text',
    'insert_image',
    'save_document'
  ]
});

const loadResults = await loadTest.run();
```

## Configuration Options

### Performance Options
| Option | Type | Default | Description |
|--------|------|---------|-------------|
| `virtualScrolling` | boolean | false | Enable virtual scrolling |
| `lazyLoading` | boolean | false | Enable lazy loading |
| `webWorkers` | boolean | false | Enable web workers |
| `memoryLimit` | string | '100MB' | Memory usage limit |
| `cacheSize` | string | '50MB' | Cache size limit |

### Optimization Levels
```javascript
// Performance presets
performance: 'high'        // High performance, more resources
performance: 'balanced'    // Balanced performance and resources
performance: 'battery'     // Battery optimized, lower performance
performance: 'custom'      // Custom configuration
```

## Best Practices

### For Large Documents
1. **Enable virtual scrolling** for 1000+ lines
2. **Use lazy loading** for images and media
3. **Limit undo history** to 50-100 operations
4. **Enable web workers** for background tasks
5. **Monitor memory usage** regularly

### For High Traffic
1. **Use CDN** for static assets
2. **Enable compression** for all requests
3. **Implement caching** at multiple levels
4. **Use code splitting** for features
5. **Monitor performance** metrics

### For Mobile Devices
1. **Reduce memory usage** limits
2. **Disable GPU acceleration** for battery
3. **Use conservative caching**
4. **Limit concurrent operations**
5. **Optimize for touch** interactions

## Troubleshooting

### Performance Issues
```javascript
// Debug performance
editor.enablePerformanceDebugging();

// Check memory usage
const memory = editor.getMemoryUsage();
if (memory > 100 * 1024 * 1024) { // 100MB
  editor.cleanup();
}

// Monitor FPS
editor.on('lowFPS', (fps) => {
  console.warn('Low FPS detected:', fps);
  editor.reduceQuality();
});
```

### Memory Leaks
```javascript
// Detect memory leaks
editor.on('memoryLeak', (leak) => {
  console.error('Memory leak detected:', leak);
  editor.forceCleanup();
});

// Manual cleanup
editor.cleanup();
editor.clearCache();
editor.destroyUnusedObjects();
```

## Examples

- [Large Document Demo](../examples/large-document.html)
- [Performance Benchmark](../examples/performance-test.html)
- [Mobile Optimization](../examples/mobile-performance.html)