Yes, this happens when you lasso and stamp numerous times in the same drawing. Everything else, including lassoing in other drawings, works at full speed. You get the warning when it takes 2 seconds to pick up a lasso selection. This is already bad. If you continue lassoing in the same drawing it just get worse.
Best to try not to lasso extensively in the same drawing (and don’t make copies of that “bad” drawing). To reset such a drawing, you can do a new blank and trace it using the light table. And then just delete the “bad” drawing.
Everything else works at full speed, it’s just the overly lassoed drawing (when picking up or stamping or undoing the pick up or stamping) and possible copies of it.