I've had lots of issues with UEVR, both with poor performance and general jankiness and crashing when injecting.
I recently upgraded my machine from a 5900X to a 9950X3D hoping the extra CPU power would help with things like UEVR (I already have a 4090) and it seems to help a bit, but I can't easily tell as most of the time it just crashes or goes wrong, whatever game I try.