And you do not need the RT-kernel anymore for that.
Not everyone has the skill to config linux. If you do though, you can get latencies down to 0.3ms, and games will be smooth like asm-coded custom hardware arcades. And ofcourse you can put all kinds of modern gpu features on that. I did that with doom3 and I have never played anything as amazing. And that was even with X, and Wayland is going to be better.
If you are into windows though, which has more SOFTWARE, there is nothing wrong with linux as an OS, then try disabling all the drivers you can. That will reduce latency on windows. And you will have a similar experience. Not as low latency, but close enough to atleast match Amiga 500, which for many is a benchmark of responsiveness. (some crackle at 1.5ms latency). Also windows has some really old drivers for instance, if you run XP which many say has the lowest latency. Try to get updated drivers.
And mac is typically better for professional work, software wise. 1.5ms latency unproblematic, but games doesn`t seem to run that well, yet, or maybe there is some option I haven`t seen yet. (turning off 3d-desktop?)
Peace Be With You.