I have a save (in peaceful) where I have been messing around designing themed buildings (blacksmith currently) however it has now reached the stage of being unplayable again.
Huge amounts of lag which I suspect is caused by the number of entities (animals) within the 3 pastures.
There are 20 hearthlings with plenty of tasks they could be doing such as mining (several quarries laid out), moving items from chests they no longer store into (all blacksmith related goods should be moved), gathering items off the floor (old floor storage now replaced by chests) however most of them are stood around the chest rows doing nothing.
The save game can be found in the link below for reference, I think I will end up starting again now that I have the blacksmith building laid out and focus on designing other buildings.