Quoting: datablobThat's cool, I think. Heh. I still don't entirely understand what ntsync does in practice, I saw that CachyOS also adopted it a while ago and read something about timing consistency. Can anyone elaborate?

Liam did a bit of an overview when it was about to land in Linux 6.14.
https://www.gamingonlinux.com/2025/01/ntsync-driver-for-improving-windows-games-on-linux-with-wine-proton-should-finally-land-in-linux-kernel-614/

The gist is that Windows has a function for a program to wait for multiple conditions and Linux doesn't. Wine first emulated that function in user space with the waits that Linux did have, but that wasn't great. But putting Windows in the kernel isn't great, either. So there have been progressing attempts to have the function working with proper performance whilst minimising the amount that having Windows games running bothers the kernel devs. ntsync is the third attempt, I think, with the first two approaches improving performance and the third improving correctness.