Extremely slow speed when backing up onto Airport Extreme disk

I have a wireless network set up with the Network Extreme basestation. The basestation has a 500 GB iomega drive attached via the USB 2.0 port. The disk comes up just fine, but when I try to use it as a backup disk from my iMac using SuperDuper!, I get an effective peak copy speed of 1.9 MB/s, and it takes multiple hours to perform a ~30 GB backup. The disk is Mac formatted.
For comparison, if I plug the disk directly into the USB port on my iMac, the peak effective speed is ~15 MB/s and the backup takes 35 min.
The iMac and the basestation are both running 802.11n, with an effective speed of 130 MB/s.
On the off chance that it was the disk imaging process that was slowing things down, I have run SuperDuper! with disk imaging back to the iMac's HD rather than the Airport Extreme HD and it runs at ~20 MB/s.
To review:
- Trying to backup to the Airport disk runs really, really slowly and takes forever
- It's not the network speed, the HD speed or the software.
What's up? Anyone else have this problem? One of the reasons I bought the Airport Extreme was to use it as a network back-up HD. If it going to take a day to copy a full iMac disk, then this is clearly unsatisfactory.

I would echo Glyn's assessment. One needs to keep in mind that Apple designed this product as a low cost device to meet the typical requirements of a home user (ie streaming of music, sharing of a few files, and backups without time constraints). If one needs the performance levels typical of a network file server, then this is the wrong product to use. Perhaps Apple's marketing information for this device should make that a bit clearer.

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