Website Performance Optimization: A Developer's Handbook

Website performance directly impacts user experience, conversion rates, and search engine rankings. This comprehensive guide covers everything you need to know about optimizing your web applications.

Core Web Vitals

Google's Core Web Vitals are essential metrics for measuring user experience:

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

Image Optimization

Images often account for the majority of a webpage's file size. Optimize them by:

• Using modern formats like WebP and AVIF
• Implementing responsive images
• Lazy loading non-critical images
• Proper image compression

Code Splitting and Lazy Loading

Break your JavaScript into smaller chunks that can be loaded on demand. This reduces initial bundle size and improves load times.

Caching Strategies

Implement effective caching at multiple levels:

• Browser caching
• CDN caching
• Service worker caching
• Server-side caching