Pathfinding needs to be fast [cached?] / needs to allow closed rooms.

[shadowpho]

Trying a big room slows games down too much, and we can't have locked doors :(

[ras0219]

Currently allows closed rooms. Large city sizes can still cause a slowdown.

The most immediately profitable path will be to simply introduce a delay in pathfinding (to cause a sort of "thinking cost" for pathfinding) so entities don't try to path too often.