A bit of a controversial suggestion, but I reckon gifs should be banned from sigs and avatars, or at least images over a certain size. Its so annoying waiting for a page to load because theres about 10 gifs on it, especially if you're loading things in other tabs (i.e. video content etc on match days). People even have them in their sigs AND avatars, just ridiculous, there is nothing wrong with having a still image as an avatar.