On my old comp (almost as strong as this one) 3,2ghz, Athlon, XP, 512 Ram, 160 Hard Drive, DVD-Burner, and more plug-in outlets than you can shake a stick at, I was downloading a song from Kazaa (think it was from the foo fighters), and in the middle of the download, it instantly slowed down, to 0,0kb/sec, then, it went -0,2kb/sec!
Then it just went back up, and continued as normal.
BTW i use Limewire for music download, and not that virus house kazaa.
Edit: My connection speed was also DSL, don't ask me the numbers. But 2 minutes tops for 1 song download back then. (now its seconds
)