The simple fact is that a lot of the higher end programs have more optimizations and better support on the Windows platform, however. Poser is by no means a standard to measure anything else against... it stands in a class all its own. But 3D Studio MAX and Maya can definately be used to measure these things against... and in my experience (and the comments made by people I've worked with on projects in the past, some of whom were predominantly Mac users), the PC support for these applications is superior to the Mac support (which dissapointed quite a few of them)