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f33e652
(Get the code!)
There is a chance the degradation in some cases is caused by the composite rendering timer drifting out of sync with your monitor. And it does, I know that for certain. When this happens, tearing becomes more visible and the frame rate can go down to half of what it should be.
*If* that is the issue for you then this fix is likely to solve it:
https:/
The fix will be available for testing in a PPA after it's been approved by more reviewers... It will be worth trying at least.