Also the pillar waterfall causes intense lag on my client, dropping my frames to 4 when the water comes out. This lag is unique to the pillar waterfall, all the others have no noticeable impact.
The second when the water stops pouring out of the pillar is also the moment it stops lagging.

Specs:
Ryzen 7 2700X
32GB 3200MHz RAM
Radeon VII GPU (AMD's equivalent of the GTX 1080)
ARK server + client installed on SSD