Here’s my save where my hearthlings are running to fight the baddies. There’s a goblin over in the woods that if you target it’ll start grinding. Hopefully it’ll be useful in determining the cause.
https://drive.google.com/file/d/1IJAdprHMK-iiKMmZ6zbxnBZrmsPZ_i9k/view?usp=sharing
Mods: Taiga Biome, Devtools, Pale Peaks Fjord
Here’s an even better example of a slowdown. One of my Hearthling archers somehow got in the water and seems to be grinding things to a halt.
https://drive.google.com/file/d/11-SnoWonVDUtnAgc8bf_UpjZ2iTDTLiv/view?usp=sharing