It's not a flaw in IE it's the same in all browsers they use one thread for javascript and UI updates. IE10 will have Web Workers which can be used to prevent t

It's not a flaw in IE it's the same in all browsers they use one thread for javascript and UI updates. IE10 will have Web Workers which can be used to prevent this but using Web Workers still involves programmers making their code work async which is the point of this post.