Blender 3.1 & 3.2 poor Image Editor performance

In 3.0.1 the Image Editor is completely smooth (moving / zooming images, UV editing. …), but in 3.1 beta & 3.2 alpha my fps drops from 144 to 20 (depends on zoom & window size, the image size doesn’t matter).
Is anybody experiencing the same issue?
(Win 10, 980 Ti).

EDIT: The same with dragging a window border, it is significantly slower now.