163 lines
4.8 KiB
Markdown
163 lines
4.8 KiB
Markdown
# Performance Optimizations Applied
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This document outlines all the performance optimizations implemented to improve Lighthouse scores and overall app performance.
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## 1. Font Loading Optimization
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### Changes Made:
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- Added `preconnect` hints for Google Fonts in `index.html`
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- Added `dns-prefetch` for faster DNS resolution
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- Font loading already uses `font-display: swap` in `global.css`
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### Impact:
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- Reduces font loading time by ~330ms (LCP improvement)
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- Prevents render-blocking font requests
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## 2. Code Splitting
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### Changes Made:
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- Implemented `React.lazy()` for all route components in `App.tsx`
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- Added `Suspense` boundaries with loading fallbacks
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- Route-level code splitting reduces initial bundle size
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### Impact:
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- Reduces initial JavaScript bundle from ~3.4MB to smaller chunks
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- Each route loads only when needed
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- Estimated savings: ~2,474 KiB of unused JavaScript
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## 3. Layout Shift (CLS) Fixes
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### Changes Made:
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- Changed `::after` and `::before` pseudo-elements from `absolute` to `fixed` positioning
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- Added `will-change: transform` for animation optimization
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- Added `overflow: hidden` to prevent layout shifts
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- Added `minHeight` to WorkflowHeroSection and parent containers to reserve space
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- Added `pointerEvents: 'none'` to pseudo-elements to prevent layout impact
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- Fixed line-height and width constraints on typography elements
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### Impact:
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- Reduced CLS score from 0.634 to 0.167 (73% improvement)
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- Further improvements expected with reserved space for hero section
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- Prevents visual instability during page load
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## 4. Component Memoization
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### Changes Made:
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- Added `useMemo` for expensive search computations in `MainDashboard`
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- Added `useCallback` for event handlers to prevent unnecessary re-renders
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- Optimized search debouncing logic
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### Impact:
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- Reduces unnecessary re-renders
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- Improves main thread performance
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- Reduces JavaScript execution time
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## 5. Build Optimizations
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### Changes Made:
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- Created `.env.production` with optimization flags
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- `GENERATE_SOURCEMAP=false` for smaller production builds
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- `INLINE_RUNTIME_CHUNK=false` for better caching
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### Impact:
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- Smaller production bundle size
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- Better browser caching
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- Faster subsequent page loads
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## 6. Resource Hints
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### Changes Made:
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- Added `preconnect` for Google Fonts
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- Added `dns-prefetch` for external domains
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- Added meta tags for better browser optimization
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### Impact:
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- Faster connection establishment
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- Reduced latency for external resources
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## Performance Progress
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### Before Optimizations:
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- **Performance Score**: 12
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- **CLS**: 0.634
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- **Bundle Size**: 3,435 KiB (single bundle)
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- **Cache**: 0% (3,514 KiB not cached)
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### After Initial Optimizations:
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- **Performance Score**: 28 (133% improvement)
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- **CLS**: 0.167 (73% improvement)
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- **Bundle Size**: Code-split into multiple chunks
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- **Cache**: Still needs server configuration
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### Remaining Optimizations Needed
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### 1. Image Optimization
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- **Issue**: `AskAlwrity-min.ico` is 78.6 KiB but displayed at 60x60
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- **Solution**:
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- Convert to WebP format (saves ~68 KiB)
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- Resize to actual display size (saves ~74 KiB)
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- Use responsive images with `srcset`
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### 2. Cache Headers
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- **Issue**: No cache headers for static assets (3,514 KiB not cached)
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- **Solution**: Configure server to add cache headers:
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```
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Cache-Control: public, max-age=31536000, immutable
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```
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For `bundle.js` and other static assets
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### 3. Bundle Analysis
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- **Issue**: Large bundle size (3,435 KiB for bundle.js)
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- **Solution**:
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- Analyze bundle with `webpack-bundle-analyzer`
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- Remove unused dependencies
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- Consider dynamic imports for heavy libraries
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### 4. Third-Party Scripts
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- **Issue**: Clerk and CopilotKit scripts add to main thread work
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- **Solution**:
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- Load third-party scripts asynchronously
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- Defer non-critical scripts
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- Consider loading Clerk after initial render
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### 5. Long Tasks
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- **Issue**: 20 long tasks found, longest 6,208ms
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- **Solution**:
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- Break up large computations
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- Use `requestIdleCallback` for non-critical work
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- Implement virtual scrolling for long lists
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## Performance Monitoring
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### Recommended Tools:
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1. **Lighthouse CI**: Automate performance testing
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2. **Web Vitals**: Monitor Core Web Vitals in production
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3. **Bundle Analyzer**: Track bundle size over time
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4. **React DevTools Profiler**: Identify slow components
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### Target Metrics:
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- **Performance Score**: 90+ (currently 12)
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- **FCP**: < 1.8s
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- **LCP**: < 2.5s
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- **CLS**: < 0.1
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- **TBT**: < 200ms
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- **Bundle Size**: < 500 KiB initial load
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## Next Steps
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1. **Immediate**:
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- Optimize images (WebP conversion)
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- Configure server cache headers
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- Run bundle analysis
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2. **Short-term**:
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- Implement virtual scrolling
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- Optimize third-party script loading
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- Add service worker for caching
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3. **Long-term**:
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- Consider migrating to Vite for faster builds
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- Implement progressive web app features
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- Add performance budgets to CI/CD
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