25% Optimizations can got a hell of a way. Hell a single optimization can increase performance of programs up to maybe 20%.

As for PS3 limitations I think SE mentioned that it will not be an issue. I think this has to do with the PS3 and PC using clients that are vastly different yet read and send the same data. Therefore if an update to graphics happen it'll not have to be updated on both ends. Though like this PS3er might complain that the PS3 version looks terrible compared to PC. I say get over that. PC is a better gaming platform; and this coming from a console gamer.