The bug you logged here is about Xorg fractional scaling, not Wayland.
They are different code bases.
Please keep comments here about Xorg and if you see problems with
Wayland then open a new bug.
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I tried the old Intel i965 driver, however, I didn't notice any
difference, so I switched back. BTW I tested only Wayland because of the
fractional scaling.
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Indeed, if you prefer long term stability then you should stay on 20.04.
We will be backporting some performance fixes to 20.04 as soon as it is
safe to do so. In fact a couple are coming in mutter 3.36.4 and another
in 3.36.5...
If you want to make 4K significantly faster on 20.04 in a safe way
I really hope that performance-related fixes could be backported to
Ubuntu 20.04 so that I would not have to upgrade to 20.10. I have never
upgraded to a non-LTS release since Trusty 14.04.
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This is expected. Fractional scaling in Xorg sessions works by rendering
at a higher resolution than your screen(s). So that increases the
likelihood of stuttering compared to integer scaling.
That specific issue will never be fixed because it's a required trade-
off to get fractional scaling
