How do I fix the slow transfer speed over USB on my 24" iMac?

I am backing up/cloning with SuperDuper, and running Lion.  The displayed transfer speed never gets past about 20mb per second.  Painfully slow....  Any suggestions?

Actually that's pretty good for USB. USB is slow - there is nothing you can do about it. Firewire always has been faster. Personally, I only use external Firewire drives for cloning or backing up. Even then, if it's a fresh clone, it'll take moe than an hour for 160 GB.
So, I schedule it when I have other things to do and walk away until it's done.

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