Just to add my 2¢: Recently upgraded my Mac's memory to 552M, added a second SCSI internal drive and installed OS X. I also managed to enable the L2 cache on the upgrade card for the first time. Changed Poser's preferred OS 9 requirement to 450M with a minimum of 120M. Time, I figured, to run the test again. For reasons I can't hope to understand the render is now slower than it was before. In 9.1 native it took 538 seconds, and in Classic mode 680 seconds. Follow the link above to the earlier thread and you'll see the worst time I had was 476 seconds. [FYI it's a 7500 with a 350 MHz G4 upgrade card] The only thing I haven't tried is rebooting into the original internal drive's OS 9 instead of the pseudo-hybridized 9.1 on the new internal drive to see if there's any difference. However, I do have to notice that P4's regular functions are still quick enough to make playing around in Classic mode worth it. Rendering, of course, is another matter altogether.