Indeed. This isn't about premature optimization, but about preventing the equivalent of what I've seen happen when you give desktop developers GWT and get a pub

Indeed. This isn't about premature optimization, but about preventing the equivalent of what I've seen happen when you give desktop developers GWT and get a public facing website with a 3 MB JavaScript app that polls a hard to generate 5k document every second just to check if a posted job has completed or not.