I have found it to be caused by hackers spawning A HUGE AMOUNT of Objects into the game, most likely OFF THE EDGE of the map The anz servers i play on battleeye stops these types of objects from spawning, giving a smooth 80 to 100 FPS for me. THe servers that have extra objects spawned i get anywhere from 40 to 5 FPS, I simply just play on ANZ. :)