I think there is a setting in some games where the FPS lowers when not focused, to save system resources. It happens with notifications for a lot of games I play too

sudo apt install wine should be fine for most applications, if any program needed something else it’d tell you. If you’re using wine for gaming, though, you would want to use something like Lutris as it uses a version of wine specifically for games

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i’m usually a lurker because i usually don’t have anything important to add to the discussion; i don’t really want to leave a lot of empty/useless comments around