That isn’t my experience at all. e.g Helldivers 2 I have to lower to medium setting, Black Myth Wukong I have to run at lower settings than Windows. This is with Debian Testing.

It isn’t just I that have observed this. I have a friend using Arch and he noticed there is a higher input latency and worse performance.

I’ve also noticed some weird mouse behaviour in Doom Eternal.

It is enough of a difference that I just reboot into Windows now to play games.