That's because it loads the page as it reads it. I believe IE renders the whole page before displaying any of it, which is one of the reasons it seems so slow sometimes. (I say, "I believe," because I haven't used IE (or even had it on my machine) in about six or eight years... other than at my brother's house, and that's rarely.)
(hide) You can use some of the simpler HTML on your messages or, if you're a paying member, can also use the Rich Text Editor. (pauloaguia) (show all tips)