Major FPS drop when using -winxp parameter

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Hey guys, so, I've been testing some different things to increase my performance in the game. One thing I've noticed with the -winxp param was a dramatic increase in performance, however, from time to time it renders hard and my fps drops considerably for about 10-15 seconds. I'm really hoping to find a possible solution to this problem while still being able to use this parameter because of the dramatic increase in performance it gives me when it's not dropping frames every now and again. I'm sure there is some way to tweak this so it's able to run off this parameter without any issues. I can provide a spec list if needed, thanks.