This says ultra low delay, but how low? It seems to me like it's still going to be limited by the browser, and then you're going to have network latency on top of that?
30ms here in Chrome and 23ms in Firefox here. But yeah, same questions -- is this over the network (or no, that's the point of a p2p connection)? What is this measuring..?
My tool is local: it measures the time from when JS says "send this to the speaker" until JS receives that audio back from the mic. It's the client-side round-trip latency.
(As far as I know, there is no way to get the browser to tell you this latency, and you have to measure it.)
Testing in Chrome on Mac OS 11.1, the lowest latency I can get is 23ms while in Firefox it's 14ms: https://www.jefftk.com/test/latency-demo-5