Web Performance Optimization Guide

In today’s fast-paced digital world, website performance is crucial for user experience and SEO rankings. This comprehensive guide will walk you through the essential techniques to optimize your website’s performance.

Key Performance Metrics

Core Web Vitals

• Largest Contentful Paint (LCP): Measures loading performance
• First Input Delay (FID): Measures interactivity
• Cumulative Layout Shift (CLS): Measures visual stability

Additional Metrics

• First Contentful Paint (FCP)
• Time to Interactive (TTI)
• Total Blocking Time (TBT)

Optimization Techniques

1. Image Optimization

<!-- Use modern image formats -->
<picture>
  <source srcset="image.webp" type="image/webp">
  <source srcset="image.avif" type="image/avif">
  <img src="image.jpg" alt="Optimized image" loading="lazy">
</picture>

2. Code Splitting

// Dynamic imports for better performance
const LazyComponent = React.lazy(() => import('./LazyComponent'));

// Webpack code splitting
import('./module').then(module => {
  // Use the module
});

3. Resource Preloading

<!-- Preload critical resources -->
<link rel="preload" href="critical.css" as="style">
<link rel="preload" href="hero-image.jpg" as="image">
<link rel="prefetch" href="next-page.html">

Performance Monitoring

Use tools like:

• Google PageSpeed Insights
• Lighthouse
• WebPageTest
• Core Web Vitals extension

Conclusion

Web performance optimization is an ongoing process. Regular monitoring and continuous improvement are key to maintaining a fast, user-friendly website.