In the case of P5X, the original coders of P5X had a battle with Apple during the transition from P4, which was delayed 1.5 years after the Windows version due to the aforementioned intransigence. Try any other 3D apps and you'll see they are as fast as (and usually faster) on Macs with the same clock speed as Windows machines. So P5X is a special case of a dog-slow 3D app. I'm hoping the new owners of CL will totally rewrite the app for the 6 version, since trying to build on the current coding errors will be a big mistake. Personally I don't blame them for having trouble with the transition, because Puma and Cheetah were a pair of real dogs, in terms of all the problems they caused.