> Is 100ms not acceptable but 20ms is? Yup pretty much. Doubling it for round-trip, 200 ms is a fifth of a second which is definitely noticeable in conversatio

> Is 100ms not acceptable but 20ms is? Yup pretty much. Doubling it for round-trip, 200 ms is a fifth of a second which is definitely noticeable in conversation. 40 ms is a twenty-fifth of a second, or approximately a single frame of a motion picture. That's not going to be noticeable in conversation all. Of course both of these are on top of other sources of latencies, too.