I was playing a game on the Ants board, and noticed my browser slowing down while I was fortifying (fortify to any connected territory is enabled, and I controlled most of the board... meaning a lot of arrows popped up every time), and eventually Firefox crashed on me. A minor problem, and I'm not sure it's one you can fix, but I thought it was worth sharing.
I had this happen a few times while testing Risky's Space Invaders map.
I think this will be fixed when the alternative fortify / attack denotion is set up - i.e. not using arrows but just highlighting available target territories.
Good idea.