To get the fastest possible download speed you'll need to make sure you have a problem free connection. If you have a hardware router you're using to share your Internet connection you will need to configure the router to allow torrent data to pass through. This video shows how to tell if you have a router causing limited connections and how to achieve a full connection. As well as a few more free programs you can use to increase your download speed from bittorrent even further.

Open the video in a seperate window.
(Makes it easier to follow along)