I think I understand. I still play AoEII only so I wouldn't know Assassin's Creed. My idea is that it would be complicated if you have massive amount of units.

I think I understand. I still play AoEII only so I wouldn't know Assassin's Creed. My idea is that it would be complicated if you have massive amount of units. The calculation could be very expensive when most units are moving. As I said, that's just my idea because I'm not a game developer.