A solid reference for web performance optimization that covers the fundamentals you actually need. It walks through critical rendering path optimizations, image format selection (AVIF vs WebP vs PNG), font loading strategies, and JavaScript code splitting patterns. The performance budgets are reasonable (1.5MB total, 300KB JS) and the before/after guidance helps you prioritize work by Core Web Vitals impact. Includes practical examples for responsive images with picture elements, cache headers, debouncing, and avoiding layout thrashing. Good for speed audits or when someone says their site is slow and you need to systematically work through the common culprits.
npx skills add https://github.com/davila7/claude-code-templates --skill performance