Looking through the tracker log I've noticed that a lot of people are using Azureus.
Well after downloading, installing and testing it I realized that any torrent I was downloading was getting 4 or 5 kb/s max. When I opened the same torrent in the official bittorrent client speeds jumped to a more respectable 20 kb/s.
At this poin I'm going to recommend that anyone using Azureus to just download the offical bittorrent client from the site. (google it, i'm too lazy to post it here)
with love
john