Severe lag in mouse clicks, menu highlighting, and keyboard while running Cuis in VirtualBox

[stephensmith9]

Using VirtualBox 6.1.38 r153438 running Cuis 5483 using cogspur vm 202205110711/squeak.cog.spur_linux64x64.tar.gz.
Ubuntu 22.04.1 is the guest OS. Windows 10 is the host OS running VirtualBox.

Using the above Cuis image, or the University image, whenever I use the mouse to open menus, etc. it lags quite unusably.

When typing into a Workspace or Text Editor, the lag is so bad that I get a delay in output and/or lots of duplicate characters.

All other applications work just fine with mouse and keyboard. It's just Cuis exhibiting this issue.