I used Poser 6 on a dual core and Poser 7 on a dual core, then a quad core then on Vista64bit. With each upgrade i saw significant improvements. I did have to optimize poser for quad core, as mentioned earlier, set up 4 seperate threads in preferences and render in a seperate process. Also Compare times very carefully, using the same type of lights, the same raytrace bounces and make sure you are on SR3