Yeah, this happens for every game after having my PC on for a while, it's not a steam issue since it also happens in beamng linux native which is launched outside of steam. I'm using opensuse. It never starts lagging during a game session, only after ending one and opening another or the same game
This sounds like https://gitlab.freedesktop.org/drm/amd/-/work_items/2950#note_2763457.
I currently have the same issue on arch.
Edit: Using and AMD graphics card (exactly the same as the issue creator)
Nothing extracted yet.
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This might not be a steam issue but I have searched it and people are having this problem and no one knows how to fix it if you know the solution please tell, even tough it might not be a steam issue.