Until now I've only played on Immense maps with standard settings with no problems;
I guess that if it gets really crowded I'll need to extend the 2GB limit.
Thanks for the link Gaunathor, useful little tool there.
On a side note, is the immense 22x22 the maximum GalCiv2 can have?
Or some mod allows for even bigger maps?
it seems "Immense" is as big as it gets, still not sure about some mod though.