that largely depends on your machine's specs but the limit is much higher that you are going to get in go, python or ruby (yes I know action cable uses go) but

that largely depends on your machine's specs but the limit is much higher that you are going to get in go, python or ruby (yes I know action cable uses go) but to get a better handle, here's some interesting reading https://www.phoenixframework.org/blog/the-road-to-2-million-websocket-connections https://www.phoenixframework.org/blog/the-road-to-2-million-... https://expertise.jetruby.com/websockets-how-to-rails-actioncable-vs-phoenix-b4d9745828c0 https://expertise.jetruby.com/websockets-how-to-rails-action... I could tell you the result but the difference is so stark, you might think I'm exaggerating