I don't know if this will help you or not but it sure did help me out......I got my puter back in late 2003 2.6ghz and Poser would always lock up on me when trying to render something big through firefly. Video card! That was the problem, I had a Nvdia FX5200 and was getting lag from high graphics online games too so I bought a Radeon 9800XT and now NO PROBLEMS rendering anything :) I'm sure you don't need to get a 9800XT as they are pretty expensive but I would look into seeing what type of video card they put in your computer. Solves a lot of problems with a good one :) Hope this helps! I just re-read your post and you are having the exact same problems I had with "adding objects" it would always lock up on me.