deftone, remember each game behaves differently in ATI or nVidia due to using OpenGL or Direct3D, the game engine and other factors. A game that runs GREAT on ATIs can run slowly on nVidia and viceversa.
Also, to poster above, I have an nVidia card and I have the same problem - thus it is not the chipset or brand what's causing the problems.
Also, I find it HIGHLY unlikely that FIFA uses more graphic-intensive effects in cutscenes than FEAR, Prey or anything like that. It is OBVIOUS the code (or a setting) is not optimized.
Finally, your patch does NOT work with my setup, so there is something obscure going on in there. I'm not saying your patch is wrong, just that the true problem lies in EA hardcodes rather than a configuration file.