But West there are at least a dozen clients, and hundreds of communities. So downloading a random album off mininova with azureus might be fast, downloading a rare movie off KaraGarga with the mainline client might be really slow, and downloading the latest blockbuster off demonoid with uTorrent might (and probably will) eat up 100% of your bandwidth (if you let it).

Definitions:

Fast on BT: up to and including 100% of your bandwidth.
Fast on eMule: 30Kb/s

Slow on BT: 30Kb/s
Slow on eMule: ... 0Kb/s? Even that is semi-normal :\

BTW-sorry for being so off-topic...