Tapping undo rapidly, will cause Rhino to crash, especially if there where some heavy operations involved. That happens on all computers I tested.
I can understand it is an abuse to do so, as computer RAM is not intended to work that way. but I do it when I am looking to find a piece of geometry I need to copy and bring back. I have to visually inspect what I am undoing.
One way to avoid this is not to tap so quickly.
Could there be another way to help the user not flood the memory and cause a crash while undoing?