Replacing the mouse did not eliminate the issue. I'd like to identify the specific layer(s), but that is tricky. There are physical hardware components (motherboard, chipset, etc.), the host OS (Redhat) and drivers, VirtualBox, ArcaOS, VB guest additions, and perhaps others. I use SAMBA extensively, for example, and I've noticed that the number of shares and files puts quite a load on the ArcaOS VM. So I've backed off some of the shares, and that has helped some.
Regards,
Bennie Nelson