Web Performance Optimization Guide

Why Performance Matters

Website performance directly impacts user experience and SEO rankings.

Core Web Vitals

### Largest Contentful Paint (LCP) Measures loading performance. Target: < 2.5s

### First Input Delay (FID) Measures responsiveness. Target: < 100ms

### Cumulative Layout Shift (CLS) Measures visual stability. Target: < 0.1

Optimization Techniques

### Image Optimization ```javascript // Use Next.js Image component <Image src="/image.jpg" alt="description" width={800} height={600} /> ```

### Code Splitting Split large bundles into smaller chunks: ```javascript const Component = dynamic(() => import('./Component')); ```

### Caching Strategy - Browser caching for static assets - Server caching for dynamic content - CDN caching for global distribution

Performance Tools

• Lighthouse
• WebPageTest
• GTmetrix
• Chrome DevTools

Best Practices

1. Minimize JavaScript 2. Optimize images 3. Use a CDN 4. Enable compression 5. Remove unused CSS

Monitoring

Set up continuous monitoring with tools like: - Web Vitals - Performance monitoring - Error tracking

Conclusion

Performance optimization is an ongoing process that pays dividends.