Hello. Fedora 39 Gnome Wayland user here.
Monitor resolutions that bigger than 1920x1080 cause external mouse pointer lag, it stutters. But the touchpad is fine. I think it is related to Mutter. I haven’t found a solution. Also Xorg doesn’t have this problem. I can’t stay 1080p because my laptop has 1920x1200 screen. And can’t use Xorg because applications I use do not work well with xorg
I sometimes have the same symptoms as you experience, but I don’t use Gnome but KDE. I have 2 screens, a laptop built-in one with 2560x1600 and an external one with 2560x1440 pixels.
Also in Xorg I have no problem at all.
Fedora 39 Gnome Wayland user as well. Ever since I upgraded to Fedora 39 a few days ago, the mouse pointer lags when the computer is heavily engaged in some processing task like opening an application or loading a vm. This never happened on Fedora 38 so something changed significantly somewhere in this new upgrade.