Interesting, because I’m not seeing this even with the latest adafruit version on 9.3b and win7 (or I’m using the wrong parts). Check your view->set grid size is set to the default .1 in (finer grids are known to cause this problem) if you haven’t already. If I could get it to reproduce I’d look at the coding of the part as being the likely performance hit (but as noted I can’t reproduce this so far).
Peter
