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I have a problem. when I play a game for a long time. For example, arc raiders or deadlock for example. After a while, lags begin. But it's strange when I use the keyboard, that is, I press keys. If I just use the mouse at this moment, everything is fine. I tried changing the keyboard but it didn't help. Only restarting the game helps. I use arch linux kde plasma wayland. It's possible that the problem is in proton. But I don't know how to find out specifically. Thanks for the help.
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Sounds like the recording stutters with disabled steam overlay: https://bbs.archlinux.org/viewtopic.php?id=302400
TLDR: Try to enable the steam overlay if you have it disabled or explicitly configuring the launch options of game in question with LD_PRELOAD="" %command% in order to override the LD_PRELOAD steam would normally append to enable the overlay
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