Hello, I use your mod on my private server.
I have detected a drop in the tps, using a profiler I was able to detect the problem and transport myself to the specific place.
In all cases, it is due to hundreds of items lying on the floor, just like dungeon chests.
I have found that this problem is due to the Treasure mod that tries to fill those chests even when they are already saturated, and then the items are left lying on the ground accumulating.

The log file "treasure2.log" confirms the problem.
https://pastebin.com/raw/Ph4XVWY7

GottschCore-mc1.12.2-v1.10.0.jar
Treasure2-mc1.12.2-v1.7.0.jar