point randomly at any web application which does anything cpu intensive at all, such as ... drawing a graph. or checking a bunch of checkboxes after deciding which ones need to be checked. or runs javascript for anything.

you are pointing at a web application that is slower than a native one, and which uses more energy than a native application.

My main complaint is that everyone is avoiding the real problems because they fear that they may be too large to tackle. so, they make up other problems and solve those because they guess that solving those problems is easier. So they write web applications and mobile applications which are larger than entire operating systems like Windows XP or Windows 2000.