I have very serious problem.It may sound weird,but i lagg everytime i meet DK.Not just from seeing him,but when he casts spells.Specially when his AOE slow goes on the ground.Cuz of this proble i can hardly play arena since i never know when can i get DK in opposite team,nor can i go in Durotar to duel,duz many DKs are dueling there.The lagg is unplayable,also FPS drops to like 5-10.This wasn't alwais,i reinstalled from W XP to W7 and problem started there.Does anyone have any idea how to fix this ?