do you know how silly it is to say "they conspired" guys, you're being a little extreme arent you? why in the name of hell would a company do something like that? there are program differences between 4&5 and platform differences between mac and win. Did you know that bryce is a "patchwork" program? the code is not "ordered" as a normal program is. Its just patched together because of the additions to code without a solid rewrite. It was NEVER intended for what it is doing now. You, Me, We as the consumer have pushed it into realms it was never conceived of going. Additionally, I 'assume' that this was the same scene with same setup. Rem, b5 scenes are larger in resolution by default than b4 (odd how its ~10%). additionally, if you are going to declare a 10% difference, you dont say "seconds" you count "hours"..then give a percentage from that. I do have gripes about it, but IMHO..this upgrade IS the best upgrade bryce has ever received. It now supports network rendering..this alone means that it life will probably not ebb into inexistence...add trees, metaballs, and user categories and you have a big improvement. There are things that could still be improved. And render times will ALWAYS be one. But , to even hint that they deliberately made the difference between platform? come on... BT