CleverRaven/Cataclysm-DDA — pull request #1546 by kevingranade (2013-06-11 01:40:38+00:00)
Title: Stop unnecessaraly saving adjacent overmaps every time they are potentially dirtied.

I think this FINALLY addresses #713, please test.
Thanks for quietus for pointing the problem out, though to be fair I believe lazycat reported something similar a while back, but it didn't click.