Regardless of legal stuff, when I'm on my Mac I use a handy program called Transmission (http://transmission.m0k.org/) for BitTorrenting. It's very lightweight, moderately fast, very reliable and has some nifty features for headless downloading.
I find that Azureus is pretty fast almost all of the time, even when on wireless (my dad uses it on a Wifi network), so I don't think the program is your problem here. I'd go for the above mentioned problem, port configurations and the like. Have you checked out Azureus' FAQ on this issue (http://azureus.sourceforge.net/faq.php#10)?
Azureus + AirPort = NIGHTMARE!!! It caused two kernel panics on my MacBook Pro, for reasons unknown, but I was downloading over our local AirPort network. I left my computer for a while, and when I came back, meters were all at zero. I opened Safari to check my Internet connection: down. I go to the AirPort menu to do a quick off/on troubleshoot, and I get the "dimmed screen of death." I figured out it was Azureus when the same thing happened again. With that said, Azureus is great, because it's Java-based and cross-platform and it tends to work faster most of the time... As long as it doesn't f*ck up your Mac in the process.
Cheers! :-) - JediJoker
Current: - "ProBook:" 15.4" MacBook Pro Core 2 Duo 2.33 GHz - Mac Classic II - Old PowerBook
Moved On: - "The Book of Power:" 12.1" PowerBook G4 Aluminum 1.33 GHz - Purple iMac
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