The javascript programmer sees no change, but things work faster. Multiplexing allows many requests in parallel to the same server over a single socket, with th

The javascript programmer sees no change, but things work faster. Multiplexing allows many requests in parallel to the same server over a single socket, with the requests completing in the order they are ready, not the order they were requested, which should reduce latencies but might lower your effective bandwidth if you only got that bandwidth because your browser opened many separate connections to the server.