1. Cap your upload (most important)
Limit your upload speed to approximately 80 percent of your maximum upload rate. You can check your upload speed over here (never trust your isp). Once you know your maximum upload speed, change the max upload (to 80%) speed in your torrent client’s preferences.
Don’t get me wrong, everyone should share as much as possible, but if your upload rate reached it’s max, your download rate suffers significantly.
Wednesday, August 08, 2007
Torrent Freak has a not-so-recent article on how to speed up your torrents.