In a previous role we did some light research into this, you tend to notice latency in movement at around 40-80ms, but thats from your own movement vs avatar.

In a previous role we did some light research into this, you tend to notice latency in movement at around 40-80ms, but thats from your own movement vs avatar. However, you don't notice it in other people's movements until there is a mismatch between social clues, Even then you have up to 250 ms (sometimes more, depending on the pace of the conversation) In practice that means you can do an atlantic call without really noticing it. the problem with VC calls is that because video needs to be matched to audio, the audio is buffered to make sure its lined up, this means that you have a 250ms+ delay plus any time to switch presenters.