Daz released bryce 6.1 today, for intel macs. I bought it and it flies compared to bryce 5.5. I have a macbook (Core Duo, 1 gig ram, 2ghz) and was nervous as to whether or not it would run. Just as a guess Id estimate it is about 2 to 2.5 times faster. Ill leave more feedback as use it more. If anyone wants anything benchmarked in particular, checked, etc etc let me know.