lag with i5 4670k in SMG

[Shonumi]

Shot in the dark, try running it at lower IRs. Normally a GTX 660 would easily be able to do 3x IR or 4x IR without so much as sneezing, but the SMG games are quite GPU intensive. I don't recall being able to run SMG2 at 3x IR fullspeed constantly, even with HLE audio. Set it to 1x IR and see if you get any speedups. If so, you're at least being limited by your GPU in some capacity.