I mean building infrastructure is literally done by private groups the government hires not the government itself. Infantalizing the government as unable to do anything is the biggest myth of the 20th century. When the government did build the roads for the interstate high system they were much cheaper. They cut through any possible regulations and just built them. If government is slow its because we have regulated government to be slow because people would get tremendous power and than plow over large African American communities with roads and rail roads. Its very well documented the speed and brutality that government can move with.

All this to say the government can be fast and efficient mostly because we have an almost infinite number of examples in the US of it doing it.