I haven't seen any difference whatsoever. Pages load at highly varying speeds - sometimes quickly, sometimes slower, sometimes very slow - exactly the way it was before, in other words. Time of day, number of users - none of that seems to matter. Even if I access a page and it takes ten seconds to load, the next page I try may only take one second, and the one after, maybe 15 seconds, regardless of image content, avatars and all that. Highly varying.