I don't know why people keep asking him to check his connection. It's on BW's side. It isn't just him that has the problem. I scratched and clawed my way through Belsavis with the horrible lagfest on two characters. It's been this bad since 3.0. I reported it then and yet, nothing has changed since then. It's still just as bad as it was then.
This is on the Ebon Hawk server btw.