I don't use a Mac so you'll have to bear with me too, until a Mac user comes along

Download a file from here & see what speed you get
http://www.magnetmix.com/video.shtml

Who is your ISP?

Files that sit connecting for ages & then need more sources forever are usually fakes. Try the All Types search, search for artist or album rather than song title, stay away from files with huge numbers of sources. Check out the thread below for more info.
Fake files showing up in search results