those that download fast is because your ip is not shaped. some few ip is not shaped for BT.

I opened the port. I saw a long list of connection come and go in my Blizz downloaded but none of them giving. Only the HTTP direct is giving me and I notice it only give me bit by bit then stop with an interval and then continue again. I could be wrong. But this is what I observed. So a 4MB patch could finish in like 1hr. Which happens to me on the earlier 2.0x patches.

Then i realized something. the HTTP direct will always give u the moment you connect then it stop after few seconds when the long interval kicks in. So I just restart the Downloader every 20 seconds for it to pick up again. It works for me so far.