This is mostly the same as bug #144264, but 8 years into the future, on Wayland on Linux, and the symptoms are much more pronounced, so I was told to report it separately. * It's extremely jittery * It's extremely slow (it "feels" slow on a graphics standpoint) * It is decoupled from the mouse cursor, you basically have to do 3x the distance / three attempts to position it to where you want. This is the video demonstrating the issue on my end: https://youtu.be/D2HDOnXup0k
Also, I forgot to mention: this is Epiphany 44.3 with WebKitGTK 2.40.3, running atop GNOME 44.x on Fedora 38 with open source AMD "Pitcairn" Radeon R9 270 graphics, using a normal wired mouse (Logitech MX510, not some fancy high-resolution gamer mouse), default mouse acceleration settings. The mouse cursor size does not affect the observed behavior. GTK animations are turned off (set to "Reduce Animation" in GNOME's Settings).