It depends on the seeds:leechers ratio, as you probably know. If a billion people are trying to get the same file, it could mean that it'll go slower or faster for you, but most likely slower. Things like the Naruto archive wouldn't have that many peers or seeds anymore, it would be better to get them from IRC. That's why I hate BT so much, it's so very temperamental when it comes to speeds and performance.

My advice is to either get Naruto from IRC, or just be patient.