Heavy FPS drops

Every single game, my FPS drops from around 160 fps to 60, 40 or even 15 at times there are heavy abilities being used
My specs are Intel I7, RTX 2060, 16GB ram, 144hz
I tested in a deathmatch where I stood still for the first minute and didn't meet a single enemy, yet the FPS drops from 190 to 50 and then back up to 130 with no pattern.
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