I have a branch with various performance improvements to the Elixir version, focused on specifically the websocket side of things. I didn't spend much time on the rest. The load generation code was flawed in overload scenarios because any socket that had an issue just stayed disconnected forever, so I assume no benchmarks were run in this fashion prior. Now those reconnect on disconnect and continue sending traffic (a more realistic scenario). Most relevant finding: In an overload situation, the rust implementation delivers a whopping 1% of messages to all connected clients, and the Elixir implementation delivers 100% of messages to all clients, applying natural backpressure to writes. Speed is cool. Rust is fast. Speed is not even close to the most important thing when building real applications.