Lag in games

I got a question... Everytime i go into a game, Ranked-normal, draft-blind, I get FPS drops when i walk passt a turret or stand still besides a turret. Im getting kind of mad right now cus it happend to me at all maps without Summoner's rift, and i like to 1 vs 1 alot and when i turret dive or something i get lags cus im near a turret, Iv'e died of it 2 times and it anoys me much. It has only happend in this patch (for me atleast). When i say FPS drops i mean FPS drops, I go from 144FPS to 20-32FPS. Comment if you can fix this or if you have any idea. Peace
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