Originally posted by TyresTyco:

The problem might be the stonewalls... a friend and I figured a lot of stone walls can make the game pretty unstable in fps.

Thats why I never use them anymore and use the hoe to alter terrain to act as my wall.

And use them very rarely for building.

I have no stone walls. I just set up the Terrain with the hoe and the terrain tools from the Mod PlanBuild.
I have only two or three stone floors for the heard inside so that I can place it.
The rest is wood based.