Azureus runs much better on Mac than it does on PC. It is bloated, I'll give you that, however that being said it is an amazing, powerful app, and I can run it without any lag or system resource issues on my 1.25 GHz G4 iMac with 1 GB of RAM using 10.3.9. It gives me a lot of the complex functionality I require for my torrenting needs, and as I said, doesn't noticeably impact my system whatsoever. 😎