Progressively loaded web pages are often the world's worst UX because apparently nobody bothers to pre-calculate the sizes of divs so everything moves around as the page loads. Which means one can't really click on things successfully because half the time the thing moves and your click ends up on something else. I guess all web devs only do things over a buhzillionabit connections on their internal local network or something unlike some of the rest of us mundane jerks who only have slow DSL?