Web Performance Optimization

# Web Performance Optimization

Every millisecond matters. Faster sites have better conversion, engagement, and SEO.

## Core Web Vitals

**LCP (Largest Contentful Paint)**

Main content should load in < 2.5s. Optimize images and server response.

**FID (First Input Delay)**

Interactivity in < 100ms. Reduce JavaScript execution.

**CLS (Cumulative Layout Shift)**

No unexpected layout shifts. Reserve space for dynamic content.

## Optimization Techniques

**Critical CSS**

Inline above-the-fold CSS. Defer the rest.

**Code Splitting**

Load only what's needed. Lazy load routes and components.

**Image Optimization**

- WebP format

- Responsive images

- Lazy loading

- CDN delivery

**Caching Strategy**

- Service workers

- HTTP caching headers

- CDN configuration

## Measuring Performance

- Lighthouse

- WebPageTest

- Real User Monitoring (RUM)

Performance is a feature. Prioritize it.