The overhead for the AI on a minecraft ant is so great that the mod creators limit the colonies to just 20 ants to prevent lag. Fine for gameplay 20 feels like a lot.
Interesting the kind of things they do: remember the location of their nest, find a path back, collect leaves etc. are so taxing.
In the real world a colony of 1000+ is typical. Some colonies have millions of ants. And real ants have much more to "process" Kind of gives you a sense of the scale of the intelligence of a colony.
