I have had this problem for awhile now, Basically, my fps goes from above 60, to 30-40 nonstop, it gets very annoying.
I have tried the suggestions on the fps help thread, repaired my client, messed with every in-game settings, updated drivers, and still having this problem.
16 gigs ram
if youre using GTX 680 its gotta be a driver issue, that VGA is sick... check for driver updates...
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