Hi, I've found the following improvements for better and smoother framerates for ps3 games.
Like set the BD/DVD upscaler set off,HDMI 24fps off, HDMI audio set on bitstream, PS2 upscaler/smoother set off.
Disable system display notify/ mediaserver off / all other automatic setting set to off / internet disable if not multiplaying and other setting etc will all help improve framerates.

I tested all the games with HDMI 720p, and all games runs more smoother, speed and more responsive, I think cell dont have to spend time in the background from those settings before.

Let us know if this also helps the framerates for you too.
Da un link di N4G, pare funzioni...