Poser 5 on the Mac is just plain slow, (about 25% slower then the PC version). It ought to be faster then the PC becuase the renderer is originally from the Mac only Tempest system from Pixels3D(which is quite fast) - my guess is that CL ported Tempest to the PC and then ported the PC port back to the Mac (ick!). More RAM can certainly speed up the render if you're doing high polygon count scenes but 512MB is more then adequate for what Tbob is trying to do. Best; Dan