Coalescing Connections to Improve Network Privacy and Performance

What this post added

This post introduces and studies the feasibility and benefits of Connection Coalescing, a technique that allows subresources from different hostnames to be fetched over the same TLS connection. It details the privacy and performance benefits, potential risks, and presents a real-world experiment demonstrating that enabling coalescing reduced TLS connections to cdnjs by approximately 78% in Chrome and 22% in Firefox for experiment group sites. The experiment involved serving cdnjs and study sites from the same IP address with compatible TLS certificates to signal browsers for coalescing.