You can figure that for every peer on the tracker, they are 'announcing' to your site about twice an hour (that is your announce time and it set by you, but usually about 30 minutes) and then for every torrent that they keep in their bittorrent client, they will need to 'scrape' every so often also. As far as how much extra bandwidth it takes, I have no idea. I run a fairly active forum and also a tracker. My forum has about 300 active users (per 15 minute cookie timeout) and about 10,000 peers average. If I take a look at my apache status, I'd say about 70-80% of the processes going on are tracker related. But, this all depends on how many torrents/peers/active users you have.
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