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

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.