I've crashed in P4 because of the large file size of V3 & M3, depending on the figures you are working with V3, is a file hog and can bog down Poser and slow your rendering speed. When I finish with a V3 the file size is usually round 30-35megs when saved. Not sure if that's the case with what you're trying to do or not. Takes too long to do what? Your loading time of a figure or Poser? What version of Poser are you using? :) (JMHO)