I've haven't gotten around to measuring it yet, but back of the envelope calculation is "between 100ms-200ms" delay from input event sent to h264 frame rendered. This is assuming virtually no network delay, so you'd be doing well with ~300ms end-to-end latency from your browser currently.

This would not work for an FPS, especially when you look at the variance in latency. There are lots of ways to shave milliseconds and stabilize latency though, so that statement is definitely not future-proof.

Yes, Broadway.js ;) Highly recommend though the documentation can be a bit "terse"