Freezing and Stuttering on T17+ maps (Series X)

Something with rare mobs lags the game immensely on T16-18 maps. Every tier of map before it is at least playable with fps dips but I physically cannot play the game when its completely frozen anytime a mob walks on screen,

Anyone else having this issue?

Edit: It seems like ANY mobs being on screen in T17+ maps completely destroys playability, not just rare mobs