Modern web applications demand optimal performance to provide excellent user experiences. This post explores advanced techniques for optimizing web performance.
Core Web Vitals
Understanding and optimizing for Core Web Vitals is crucial:
- LCP (Largest Contentful Paint): < 2.5s
- FID (First Input Delay): < 100ms
- CLS (Cumulative Layout Shift): < 0.1
Build-Time Optimizations
Code Splitting
// Dynamic imports for better code splitting
const LazyComponent = lazy(() => import('./LazyComponent'));Tree Shaking
Eliminate unused code by properly configuring your bundler.
Asset Optimization
- Image compression and modern formats (WebP, AVIF)
- Font subsetting and preloading
- CSS and JS minification
Runtime Optimizations
Caching Strategies
- Browser Cache: Long-term caching for static assets
- CDN Edge Cache: Geographic distribution
- Service Workers: Offline-first experiences
Critical Resource Prioritization
<link rel="preload" href="/critical.css" as="style">
<link rel="prefetch" href="/next-page.js" as="script">Monitoring and Measurement
Use tools like:
- Lighthouse: Comprehensive audits
- Web Vitals Extension: Real-time metrics
- PageSpeed Insights: Field data analysis
Performance optimization is an ongoing process that requires careful measurement and iteration.