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I have done a variety of tests on my console and have spent a few hours to get to the root of the FPS-Drops.
It turns out (And trust me, I have sufficient evidence to back this up if Treyarch need it) that most of the FPS-Drop cases are NOT in fact caused by the Game engine, Resolution or PlayStation Brand (I.e. Slim/Fat).
The root of the problem actually lies with-in the new embedded friends system in-game. It seems (From what I can see) that every friend you have is being verified very frequently to check their; online status, in a game status and Level. This constant request for information is slowing down the game play as it is needing a lot of CPU power all the time to do this, taking up more and more system resources and resulting in fluctuating FPS.
This explains why some people are experiencing it, some aren't and some are only getting low level symptoms. The more friends you have, the more FPS drops you are going to receive. This brings me to the conclusion that all of the rumors going around that "Treyarch can not patch this" are in fact false, as I believe updating the friends system to maybe put a larger interval between checks would counter the problem quite well.
The reason this did not get picked up in beta testing (closed beta) is because the developers systems would not have their friends systems maxed out, Thus they wouldn't have even noticed anything like what we're experiencing. I still believe the whole thing is still due to a bad port to the PS3, it seems to me that they have not checked the ported player/friends system properly and thus this has happened. But still, if this is the case (which I strongly believe it is and have lot's of evidence to support this) then it should be very easy for Treyarch to patch, so don't worry .
Update: Although this has fixed it for the majority there is still a large number of people with-out a fix, I am aware of this and i'm sure Treyarch are too, Please stop continually posting "This is crap, Doesn't work, not a fix at all" as you all have a different problem (Which I am putting down to HDD Space atm, but that's not a certainty) so if it doesn't work, instead of responding with the above put the details about your console as a post. For the majority - I hope this thread has helped. For the rest - I'm doing my best .
If you have any questions please feel free to email me, and hopefully Treyarch read this and sort it out .