Do you have any performance numbers for other non-Node WS libraries, e.g. Go (stdlib and gorilla), Rust (ws-rs, mio-websocket etc), Python, Ruby? Would be super interesting to see!
https://hashrocket.com/blog/posts/websocket-shootout
I've used websocketpp in the past (in C++), with fairly good results, but uWebSockets is in a whole other league; especially in a multi-threaded server.