Consider completely disabling the smooth-scrolling animation in the palette
MuseScore 3.5, Windows 10, 1920x1080 resolution, 1.5x UI scaling.
To reproduce: Open the "Palette" panel. Open a few categories. Scroll the panel using a mouse-wheel or a laptop touchpad. Then, open the "Preferences" dialog and navigate to the "Shortcuts" tab. Scroll the list of shortcuts using the same method.
Expected behaviour: Scrolling should be consistent.
Observed behaviour: Scrolling the list of shortcuts is instantaneous. Scrolling the palette for short distances introduces approximately one second of delay while a smooth-scrolling animation plays. Scrolling the palette long distances (say, from top to bottom with several categories open, using a particularly sensitive laptop touchpad) plays a much longer animation, approximately two to three seconds in length.
I find that this animation makes the palette difficult to use.
I also note that the length of the transient "scrollbar" seems to fluctuate during scrolling, and that scrolling with my laptop touchpad is hypersensitive, making accurate touchpad scrolling impossible. It seems likely that these are all facets of the same problem, along with issue #294613.