Web Performance Best Practices

Core Web Vitals

• LCP (Largest Contentful Paint) < 2.5s
• FID (First Input Delay) < 100ms
• CLS (Cumulative Layout Shift) < 0.1
• Measure with Lighthouse/WebPageTest

Loading Performance

• Minimize bundle size
• Code split by route
• Lazy load images/components
• Use preload for critical resources
• Enable compression (gzip/brotli)