Anecdotically, 7ms vs 3ms latency is felt as weirdly heavy action when playing midi keyboard. It's not felt as latency, but it's felt. And I bet the difference could be reliably established in double-blind testing (3 samples, find an outlier).
1ms seems less believable, but I wouldn't be surprised, if some people could notice that too.
Anecdotically, 7ms vs 3ms latency is felt as weirdly heavy action when playing midi keyboard. It's not felt as latency, but it's felt. And I bet the difference could be reliably established in double-blind testing (3 samples, find an outlier).
1ms seems less believable, but I wouldn't be surprised, if some people could notice that too.
Again I have to point to this Microsoft Research Video.
https://www.youtube.com/watch?v=vOvQCPLkPt4
Fantastic video. QED.