Hey, love your mod, I didn't want to clutter the comments, so I created this discussion. This is probably not the full fault of your mod, but it only happens with it enabled, I believe it has to do with being able to buy your animals through Vanilla Factions Expanded - Medieval 2's barter with the merchant factions...

https://gist.github.com/HugsLibRecordKeeper/e35cdfc4631597a381ca811a8e7b5704

I believe this is what creates a recurring red error that tanks TPS and can be stacked.

System.NullReferenceException: Object reference not set to an instance of an object
[Ref BB8B4E5]

if this is not your issue, let me apologize in advance. thanks