6-click-performance.md

Click Performance Optimization

Overview

This document details the performance optimizations implemented to reduce checkbox click response time from 700ms to near-instant operation. The optimizations focus on efficient data structures, caching, and UI updates while maintaining functionality between Simple and Advanced modes.

Key Optimizations

1. Set Operations

// Before: Array operations
keywords.filter(k => activeKeywords.includes(k))  // O(n) lookup time

// After: Set operations
const activeKeywords = new Set();
keywords.filter(k => activeKeywords.has(k))       // O(1) lookup time

• Replaced array operations with Set operations
• O(1) lookups instead of O(n) array searches
• Faster add/remove operations with Set.add() and Set.delete()
• Eliminated duplicate handling automatically

2. Enhanced Caching System

const cache = {
    keywords: new Map(),
    categoryStates: new Map(),
    contextKeywords: new Map(),
    activeKeywordsByCategory: new Map(),
    lastUpdate: 0,

    getKeywords(category, sortByWeight = false) {
        const key = `${category}-${sortByWeight}`;
        if (!this.keywords.has(key)) {
            this.keywords.set(key, new Set(getAllKeywordsForCategory(category, sortByWeight)));
        }
        return this.keywords.get(key);
    }
}

• Implemented memoization for expensive operations
• Cached keyword sets by category
• Cached active keywords by category
• Cached context-specific keyword sets
• Added intelligent cache invalidation

3. Deferred UI Updates

const debouncedUpdate = (() => {
    let timeout;
    let frameRequest;
    return (fn) => {
        if (timeout) clearTimeout(timeout);
        if (frameRequest) cancelAnimationFrame(frameRequest);

        timeout = setTimeout(() => {
            frameRequest = requestAnimationFrame(() => {
                fn();
                notifyKeywordChanges();
            });
        }, 16);
    };
})();

• Batched UI updates using requestAnimationFrame
• Debounced state saves
• Prevented UI thrashing
• Reduced unnecessary re-renders

4. Optimized State Updates

// Before: Multiple individual updates
state.activeKeywords.add(keyword1);
state.activeKeywords.add(keyword2);
saveState();
renderInterface();

// After: Batched updates
keywords.forEach(k => state.activeKeywords.add(k));
debouncedUpdate(() => {
    saveState();
    renderInterface();
});

• Batched state changes
• Reduced number of save operations
• Minimized localStorage writes
• Optimized state synchronization

5. Memory Management

cache.invalidateCategory(category) {
    if (!this.shouldInvalidate()) return;

    const patterns = [`${category}-true`, `${category}-false`];
    patterns.forEach(p => this.keywords.delete(p));
    this.activeKeywordsByCategory.delete(category);
}

• Improved cache size management
• Selective cache clearing
• Reduced memory footprint
• Prevented memory leaks

6. Throttled Operations

shouldInvalidate() {
    const now = Date.now();
    if (now - this.lastUpdate < 50) return false;
    this.lastUpdate = now;
    return true;
}

• Added throttling for cache invalidation
• Prevented redundant operations
• Reduced CPU usage
• Improved responsiveness

Implementation Locations

1. State Management (state.js)

• Core Set operations for state tracking
• Keyword caching system
• Debounced state saves
• Memory-efficient state updates

2. Context Handling (contextHandlers.js)

• Enhanced caching with memory management
• Batch keyword operations
• Optimized UI updates with requestAnimationFrame
• Throttling for rapid operations

3. Mute Operations (muteHandlers.js)

• Mute-specific caching
• Batch processing for keywords
• Debounced UI updates
• Optimized Set operations

4. Keyword Operations (keywordHandlers.js)

• Category keyword caching
• Batch processing
• Optimized DOM operations
• Throttling for rapid toggles

Results

• Reduced click response time from 700ms to near-instant
• Maintained functionality between modes
• Preserved state consistency
• Improved overall responsiveness

Best Practices

1. Use Set operations for collections that need fast lookups
2. Implement caching for expensive operations
3. Batch UI updates and state changes
4. Use throttling for frequent operations
5. Manage memory efficiently
6. Maintain functionality while optimizing

Trade-offs

1. Slightly increased memory usage for caching
2. Added complexity in cache invalidation
3. Delayed state persistence for performance
4. Required careful management of cached data

Future Improvements

1. Consider implementing Web Workers for heavy computations
2. Add cache size limits
3. Implement progressive loading for large datasets
4. Add performance monitoring
5. Optimize cache invalidation strategies