I'm on an amd 1.4 with 512ddr. P5 is not significanly slower. Unless I get the stopwatch out, it seems about the same to open and work with. Its just fine after a good Crown Royal Special Reserve. After about ten of those it starts spinning though so I'll have to report that to the bug committee. One thing that I do notice is that when moving Judy closer or farther from the camera, its slightly notchy. This does not occur when moving the P4 female around. So, my thought is that the interface is just as fast, maybe faster than P4 and the increase of the new model mesh brings it back to about the same as the older version with the older models. I do plan to upgrade soon. I guess Moore's Law applies. The capacity of computing doubles every 18 months and its only fair (even appreciated) that new programs take advantage of that.