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Is this writing to the NAS, or you mean reading from the NAS, via USB, to a device on the network? I've found my USB port to be extremely slow as well. I backed up a 1.5TB drive using the one-click backup feature and it seemed to take about a day and a half. It would have been quicker to plug the drive into a computer and copy to the NAS over Ethernet.Perhaps the USB port only operates at USB 1 speeds?
Just tried my USB2 passport drive and that's giving me around 10MBps reads. Not exactly setting the world on fire, but still nowhere near as bad as what you're seeing!Do you have any extra services running on yours? (UPNP media server, P2P etc...) Are you using the cable that came with the drive?
Might be worth disabling UPNP just to test it... This device isn't exactly great at multitasking, even if one of the tasks is just lying dormant!