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Update: I was able to induce this behavior to at least have a lead, on EndeavourOS (Arch btw) with KDE.

KDE System Settings -> Display & Monitor -> Screen tearing: Allow in fullscreen windows. Enabled by default. If disabled, I see exactly the same video pauses, on both fullscreen and windowed wine/proton-ge games.

Original post: How do I even begin to troubleshoot this?

Steam games work fine. Linux-native games work fine. In Wine games, the game video seems to pause for 1.5s, then plays for 2.5s. Audio is unaffected. It seems like the frames are lagged, not lost; when video resumes, the "missing" frames play back very quickly, like the video is "catching up". This happens even in the games' launcher windows before 3D rendering or GPU load occurs. Mouse pointer does not lag or pause.

This happens in both wine-ge 8.26 and WineHQ Staging 9.22.

The weirdest thing is that without changing any settings, the same games will run fine about 1 out of 20 launches.

Thanks for any input.