I congratulated you because your connection is well set up and good enough to be an Ultrapeer--able to handle far more messages and traffic than most. Sometimes Ultrapeers are also called Supernodes.

See Arne's http://gnufu.net/ (in German or English)

You shouldn't really notice much slower web browsing and email, but online gaming will be slower.

Check the Library Pane and the Monitors Pane.

The Library shows the files you share, and the Monitor shows the uploads in progress (and pieces of shared downloads that others are also getting)