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 working in Xorg. HOWEVER, general
performance will increase a lot in future versions like Ubuntu 20.10 so
that hopefully will be enough to offset and eliminate all the problems
you see.
As for fractional scaling making things slower than not scaling, that is
expected and can't be fixed. If you can then please use Wayland instead.
** Tags added: xrandr-scaling
** Changed in: mutter (Ubuntu)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/1890802
Title:
Big performance degradation in X11 + 4K resolution + fractional
scaling in second monitor compared to Wayland
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