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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1890802 Title: Big performance degradation in X11 + 4K resolution + fractional scaling in second monitor compared to Wayland To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1890802/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs