Click on the apple top left and About this Mac for computer details.
Also go to
http://www.dslreports.com/stest and do a couple of speed tests and to
http://www.magnetmix.com/video.shtml and download a file from there and see what speed it makes. This will give you an idea of what sort of speed you should expect.
The following link has a lot of information you will find useful. If you still need help go to the second post where you will see what information would help us help you:
http://www.gnutellaforums.com/showth...threadid=51357