I have a G4/450 with 1.5g ram. I have notice it being slow also. I get alot of the spinning cursor/colorwheel when ever I try to do something. It renders fast when I can get to that stage but usually I have to deal with several annoying crashes. I wouldn't have bought it if I had know that there wasn't the real integration with Poser like there is on the PC version. I am trying to think positive but after dealing with customer service I am getting nervous. oh well....