Just to clarify, do you mean this lifetime is implemented in Phoenix JS lib, or somewhere else?
The packets transmitted over the channel’s WebSocket are not delayed at all. It’s the request/response lifecycle that’s delayed inside of the Channel’s logic (via Process.sleep). So, when a message is sent, it’s going to be sent as fast as possible from client → server and server → client.
WebSocket itself does not have the concept of request/response lifecycle, so that’s all implemented by Phoenix’s libraries.