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Web Performance Basics

Sarah Chen · · Performance

Performance is a feature. A fast site improves user experience, SEO, and conversion rates.

Measure First

Use Lighthouse and Web Vitals to establish a baseline. Focus on Core Web Vitals: LCP, FID, and CLS.

Optimize Images

Serve modern formats like WebP or AVIF. Use responsive images with srcset. Lazy-load images below the fold.

Minimize JavaScript

Every kilobyte of JavaScript has a cost. Ship only what you need. Tools like Astro make this easy by defaulting to zero client-side JS.