Web Performance Optimization: A Comprehensive Guide

Performance is not just a feature—it's a fundamental aspect of user experience.

Core Web Vitals

Understanding the metrics:

• LCP (Largest Contentful Paint): < 2.5s
• FID (First Input Delay): < 100ms
• CLS (Cumulative Layout Shift): < 0.1

Optimization Strategies

1. Image Optimization

• Use Next.js Image component
• Implement lazy loading
• Modern formats (WebP, AVIF)

2. Code Splitting

const Component = dynamic(() => import('./Component'), {
  loading: () => <Skeleton />,
});

3. Caching Strategies

• Service Workers
• CDN configuration
• Browser caching headers

4. Bundle Optimization

• Tree shaking
• Code splitting
• Lazy loading

Measuring Performance

Tools we use:

• Lighthouse
• WebPageTest
• Chrome DevTools
• Real User Monitoring (RUM)

Results

After optimization:

• 65% faster page load
• 40% reduction in bundle size
• 90+ Lighthouse score