yeah, if you made a city, then it's gonna do that to you. I beleive Fat hull is the large open areas it's buildeing though I might be wrong. But usualy when I'm making a big level I compile after every big change so it won't have to take it all in at once. lol, maybe the dosen't even work. But if you're gonna make a city, don't have building interiors mixing with the exteriors that'd make building for ever, if you want to do interiors then make then separate maps, just some tips to help your future map building.