Still having serious issues with this. I'm getting stock sizes for a handful of simple-ish parts just now and the responsiveness gets insanely sluggish after just a few minutes. I've had to restart mastercam 4 times in the last couple hours. Literally nothing but using hotkeys slows it down. Last month I was working on some wheels for a car and it ended up being a 750MB file. No problems whatsoever until I had to draw some geo/use hotkeys. This is nuts. I'm going to shoot an e-mail to Mastercam I guess. Edit: Didn't use the same account as last time (I guess I have an account for work that I can't access right now) but this is the OP in case anyone is wondering.