Fixing slow Time To First Byte by edge-caching HTML with Cloudflare Workers and automatically purging the cache when content changes.
Code walkthrough on using Cloudflare workers to improve the performance of sites using Google Fonts. The improvements can be quite dramatic and the sample provides a real-world use case of doing streaming HTML modification in a Cloudflare Worker.
Getting the best end-user performance from HTTP/2 requires good support for resource prioritization. While most web servers support HTTP/2 prioritization, getting it to work well all the way to the browser requires a fair bit of coordination across the networking stack.