I've been having the same problems as Dave-So. P5 just keeps getting slower and slower. I've even reinstalled the program, no luck. I finally gave up and reinstalled Poser Pro and use that for regular posing, etc and I use a stripped down P5 just for rendering. I never liked P5: the material editor is bewildering and it is the slowest program I have ever used, and I have a very fast computer.