i had a very similar issue happen with my entire PC about two weeks ago, and it also affected OBS

I ended up having to do a clean uninstall of my video card drivers using DDU, then reinstalling, and it fixed it

Other than that use nvidia software to cap vtubestudio's FPS to 60 to save performance
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It doesn't seem like it's an OBS issue because the recording is clean- if it was an OBS issue the recording would have artifacting, but it doesn't. OBS is just capturing what your PC is showing you, so there's a performance issue elsewhere on your system
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