I read somewhere that it starts to lag when you save big files, so the farther along you go in the game, the more laggy it will get. One way possibly to help in this issue is cleaning up some of the files in the PS3 from other games. I'm not a PS3 expert nor a computer expert so I might be way off based.
This issue right here is one of the reasons why I always buy games like this for the PC. The PC has the ability to store massive amounts of information. While the PS3 does have a great memory core, it still doesn't match that of a PC. I mainly use my PS3 for sporting games and use my PC for RPG's like Skyrim, Mass Effect, and Dragon Age.
“Our next home stand follows this road trip.”
“I just want to tell everyone Happy Easter and Happy Hanukkah.” says on the day before Easter