So my framerate for crysis 2 at 1680x1050 DX11 Ultra is 45-60+ but when I shoot the frames drops to 30 or so, then after finished shooting the frames goes back to 60+. But in DX9 and texture pack my frames is always over 60. Anyone notice this or how to fix it. My system is i7920@3.6, 5870 CrossfireX, 6 Gig Patriot Viper 2 Sector 7, MSI X58 Platinum, Windows 7 64 Bit, Corsair 850TX.

Try installing the new AMD drivers, also something that helped me greatly: Keep CPU as cool as possible, i got two fans cooling it now after i modified the CPU cooler, i also got the side of the case open and when gaming i got a 12" desk fan blasting inside it.

thanks, but my CPU runs at 40c tops, I have an Ultra Kaze fan blowing right on it. and I do have the latest drivers, 11.8 preview did add a few frames but the shooting slowdown is still there.

Try dropping the particles down to very high.

Try dropping the particles down to very high.
okay, will do later today and post my results. Thanks Wrath. it would make sense its one of the settings.

Well the particles on ultra with my GTX460 are very expensive. They cast shadows and motion blur is applied to the particles, so they're very heavy.