User blog comment:G0LD3NF1RE/Dawnguard encounters issues with Playstation/@comment-2060279-20120908195526/@comment-90.198.150.207-20120909204020

I'd say it's not to do with the OS and more the actual hardware. The PS3s Core processor is extremely quick BUT this kind of architecture has never been used to play games before whereas the Xbox is closer to a PC.

Skyrim was designed and built on a PC for a PC and then scaled down for the consoles.

The 360 does have a faster GPU which may be helping in this case as well. I would be interested in what the actual issue is. :)