[quote name='LouieT']Short answer: PS3 has half the system RAM of Xbox 360.
If the save file gets up past 10MB, the PS3 version of the game will experience slowdowns, stuttering and very long load times because of the low amount of memory.
There were many updates to try to fix these issues, but the slowdown problems has not gone away completely.[/QUOTE]
i thought that 360 and ps3 had the same system RAM, but for 360 it was all pooled (for video or otherwise), while ps3 splits it (1/2 to video, 1/2 to system), and that the ps3 code wasnt (initially) optimized for this. after the patch, the laggy went away (for me)