large scale

Hello there, I know that the bigger the map is, the slower it will get to place units edit the terrain and etc.. But what exactly causes this, is it simply when the map exceeds a certain size in terms of map size or filesize. I just know that it's a bit stressful as it is when placing units...

EDIT: Project discontiued, as I have lost interest in (this kind of-) map making In a world torn apart by a catastrophic daemon ritual known as 'The Rift' factions old and new strive for control over the lands of Pan - and dominance of the other factions. Players The map supports up to 10...