I have been doing a lot of testing, and this cannot just be a driver issue. I've used FOUR different driver sets(cat 5.7, 5.8, Omega 5.7 and 5.8), and EVERY time, it will slowdown. I even reformatted and reinstalled Windows, to no avail.
I tried turning down acceleration in dxdiag, didn't work. (i have an audigy 2)
I'm running the KT-400 chipset from VIA. Even installed new 4in1 chipset drivers. Never had a game issue until now, with Madden.
NHL 06 runs fine. Every other game on my PC runs fine. I have no idea what the problem is.