Poser 4 here, with the 4.0.3 update. I'm fairly sure it's as much as my computer can handle — I don't have a brand new all-singing all-dancing system, remember not everyone can afford to constantly chase the upgrade trail. I get crashes, of course, especially since I still use Win98, but if I remember to save often enough I can work around that. I'm happy enough, and I can do most of what I want with P4.