Why Performance Matters
Every 100ms of load time costs you conversions. Users expect fast websites, and search engines reward them with better rankings. Performance isn't just technical - it's a business requirement.
Core Web Vitals
Focus on Google's Core Web Vitals: Largest Contentful Paint (LCP), First Input Delay (FID), and Cumulative Layout Shift (CLS). These metrics directly impact user experience and SEO.
Optimization Strategies
Image Optimization
Use modern formats like WebP and AVIF. Implement lazy loading. Serve responsive images with srcset. This alone can reduce page weight by 50-70%.
Code Splitting
Don't send all JavaScript upfront. Split your bundles by route and load them on demand. Modern frameworks like Next.js and Vite do this automatically.
Caching Strategies
Leverage browser caching, CDN caching, and service workers. Cache static assets aggressively. Use stale-while-revalidate for dynamic content.