What Ballistic said happens to me too. I think it is GPU dependent becuase of that reason. I don't have actual knowledge but a lot of experience with it. My game usually gets bottlenecked on the CPU, but when blastcore is running I don't get frame drops on giant explosions, thanks to my beast GPU. But when blastcore is off and it's ArmA's explosion and smoke effects it lags my game more, usually because of the CPU. Blastcore on the other hand (i guess) uses GPU rather than CPU for all the effects.