I am at a point in my city where I have more cash than I know what to do with it (~$8M). I am used to the slow-growth model of the simulator. For those who have been tracking, I have a nice peripheral highway system that is half-finished. If I filled all of that in in one shot (say about 2 sq km at a time) along with the requisite services, would that be considered growing "too fast"? At what point would growth be considered too fast in the simulator?