Once you start monitoring real users you understand it’s not just about your own performance. In fact one of the first things you discover is how blind you really are. You see degrading load times and don’t know what caused them, so you have to come up with a good idea of how to get the information you really need. This is when you realise that you don’t have to wait for the newest W3C specs to be available.
Video producer: http://velocityconf.com/