Fix my Vuze, and win a cookie!

Your torrent software shouldn't have much to do with your speed. Your connection, firewall settings, and the source are the main things that matter.

I heard the feds went after a bunch of trackers this weekend, could be related to your issues.

Your torrent software matters if your ISP is throttling torrent BW. Some torrent software takes measures to mask the traffic, other software does not.