This might not be a bug... Because X11 fractional scaling is implemented
using an extra-large screen buffer and copying it (scaled down) to the
real framebuffer. Both of those facts make Xorg fractional scaling much
slower than integer scaling. Wayland fractional scaling has no such
performance problems but the Nvidia driver is not well supported with
Wayland :(
I suggest your best options are either:
* Don't use fractional scaling at all; or
* Enable experimental Nvidia Wayland support:
1. In /etc/default/grub add the kernel parameter: nvidia-
drm.modeset=1
2. Comment out the Nvidia rule that is disabling Wayland in
/usr/lib/udev/rules.d/61-gdm.rules
** Changed in: mutter (Ubuntu)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/1907189
Title:
Apps become unresponsive and lag when multiple windows opened and
fractional scaling enabled
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