Maybe I'm about to show my ignorance here, but sally forth...

A quote from this article which is quite an interesting read on Bram Cohen, the creator of BitTorrent.

"...Sites like Kazaa and Morpheus are slow because they suffer from supply bottlenecks. Even if many users on the network have the same file, swapping is restricted to one uploader and downloader at a time. And since uploading goes much slower than downloading, even highly compressed media can take many hours to transfer..."

Huh? I've used BT, and non-empirically, it doesnt seem faster than Kazaa. The explanation doesn't even hold water, as Kazaa downloads 'chunks' of a file from multiple source. I must be missing something no?