I have gotten up to all kinds of tricks with rendering in order to save computing time and to speed things up Michael, and i still do. This was just to try the stability of version 3 beta, it was stable, but i quit the boolean process after 1hr and 20 mins on a quad core @ 3.2Ghz and 8gb. Any chancr you can tweak the code to be multi-threaded when needed. All the best and thanks for producing a wonderfully intuitive app!

Martin