First a rant: for the sake of everybody involved in web development, please use a less ancient and crappy browser, like Firefox, Chrome, Safari or Opera. If you must use IE, at least use IE9. IE8 support costs our front-end devs more time than all other browsers combined, and we don't even strive for the same performance and level of features for IE8.
That said, this sounds like an issue with your internet connection, home router or TCP stack. Do you have the same issue in other browsers? What if you boot from an Ubuntu live CD?