Cloudflare Blog: Prototyping optimizations with Cloudflare Workers and WebPageTest

The potential performance improvement of loading a page over a single connection, eliminating the additional DNS lookup, TCP connection and TLS handshakes, can be seen by comparing the filmstrips and waterfalls. There are several reasons why you may not want or be able to move everything to a single domain, but at least it is now easy to see what the performance difference would be.