https://bugs.winehq.org/show_bug.cgi?id=51420
--- Comment #24 from mitchell4136@gmail.com --- Do you have the usual "fallback to Randr 1.0" log message? Seems to be related to this bug as a whole. I certainly get it while being on the proprietary driver. Someone earlier mentioned that Randr 1.0 reverts to polling actual hardware, hence the high xorg CPU usage.