Protocol
HTTP/3 over QUIC, 0-RTT resumption, and connection reuse cut round trips.
Content
Brotli, Early Hints, Rocket Loader, Speed Brain, and Cloudflare Fonts (Auto Minify retired in 2024).
Images
Polish for WebP/AVIF, Mirage on mobile, plus Cloudflare Images and resizing.
Measure
Observatory tracks Core Web Vitals with both field and lab (Lighthouse) data.
