https://bugs.winehq.org/show_bug.cgi?id=45121
TheLinuxGamer eimantopastas@hotmail.lt changed:
What |Removed |Added ---------------------------------------------------------------------------- CC| |eimantopastas@hotmail.lt
--- Comment #8 from TheLinuxGamer eimantopastas@hotmail.lt --- I can confirm also having this issue of high CPU usage for almost a year. for me it is usual for Steam + wineserver to use 60% CPU while idle. it seems like setting Steam to offline mode sometimes fixes it,however multiplayer games tend to not work in offline mode.
I personally can recommend to try freezing Steam with lxtask after launching games to avoid significant fps drop ,however freezing Steam sometimes as well freezes games.