Like with studio 4.9 now. I had go back down in comp spec after powerful system died. With iray included as studio goes up then get more program not responding, when doing 3d light renders. Went up to pp11 and now with superfly included get same probs as with studio, program not responding every so often but had no program crash and could still render. I have never had problems on old posers. But i believe when studio 5.0 comes out and poser 12 comes out. The not responding and windows lock up every so often will get worse. But it is worth it for the extra things you can do with program, but has 1 big prob, from poser 4 up to poser 8 you could see thumbnails in library. From 9 to 14 and pp11 you get run time thumbnails that are blank.