Uh, all the tracker does is track who's on the torrents. The only way the Tracker would affect speed at all is if it went down; peers would have difficuly locating each other for new connections.
Speed on BT is all about how many people are seeding vs. how many are still downloading in the swarm. There should ALWAYS be more seeders than downloaders for a Torrent to be in good health.
What I also might note is that leechers tend to get throttled. If your share ratio is low, don't complain about shitty download speeds. You should always seed at least 1.5x the size of the download.
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