Interesting, just tried this, where I compared my laptop (Ubuntu) and desktop (Arch) with my Macbook, and the latency actually seems lower on Linux than OSX, seems OSX has some smoothing that seems to make things look/feel slower. Scrolling is clearly faster on my laptop and desktop than the Macbook (didn't even had to record a video to see the difference), tried Firefox on both Linuxes and Safari/Chrome/Firefox on Macbook with the same result.

So the quest continues...