TC is right, but it's not BAD. There is a little slowdown (about 25 fps or so)? YES. Is it annoying or disruptive? NO. It depends on the area and if you set things on fire, but trust me that after a while playing you won't notice.
There is texture pop-up too, and this one is noticeable, you will see things "appear" at certain distance. Anyway, enjoy the game as it is because it's pretty damn fun.
If you want a good frame rate from a new game on a 7 year old console, try buying a PC instead - nobody could guarantee 100% it will be fine on everyone's console even if they tried. --- Currently Playing: BF3, Fifa 13, Diablo 3, CSGO
Based on the gameplay vids I have seen of people play on youtube, the 20ish fps isn't really that bad when it stays within that range. --- GT: Boomer and Tank Pretty darn confident..... I don't want to have to wait till the Microendony XBOXS 4ii comes out another 15 years later....