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FYI to everyone, i discovered that this is related to my using SteelSeries ExactMouse tool, which I use to turn off the acceleration to the mouse...
wow! that worked for me on linux! it went from totally unusable experience with my mouse, to perfect mouse tracking. how did you discover this...
oh, i realized the problem is exhibited differently in macOS guests. but it seems to be related to fast accelerations of the mouse. in macOS...
I'm experiencing a jumpy mouse cursor when using my Corsair Harpoon RGB Wireless Gaming Mouse with and without guest OS tools installed on Linux...