Isn't Wayland always one frame delayed compared to Xorg to avoid tearing or has that been changed? If so, his very high refresh rate would minimize that effect
I don't think there was ever a design to be one frame behind.
Compositing requires the GPU to do some extra work to draw the frame to be presented. This typically takes very little time (much less than a full frame period). Additionally, most wayland compositors will bypass that extra step if an application is full screen (wlroots calls it "direct scanout").
Also some wayland compositors keep track of timing and delay the final composition until right before it is time to present the frame in order to reduce latency.
Yes, but the same is true in Wayland and it's automatic as well. Full screen applications don't require compositing so they typically don't, and this was the case in MOST X11 compositors as well.
Turning off compositing before launching a game is maybe a bit misguided, sort of like turning on the "classic theme" in Windows 7 before launching a game. It might save some memory, sure, but latency should be identical.
Tearing can theoretically improve latency for the part of the screen that's below the tear, but in any case where you could actually benefit from it the difference would be at least order of magnitude smaller than the duration of one frame.
Compositing requires the GPU to do some extra work to draw the frame to be presented. This typically takes very little time (much less than a full frame period). Additionally, most wayland compositors will bypass that extra step if an application is full screen (wlroots calls it "direct scanout").
Also some wayland compositors keep track of timing and delay the final composition until right before it is time to present the frame in order to reduce latency.