Incredible slowness with LaCie 250 usb drive when trying to delete files

I connected a LaCie d2 250 gigabyte drive to the usb port of the new Airport Extreme. When I try to delete a folder containing a a fairly large amount of data (40,000 files) it took approximately 30 minutes to tally the number of files and then another 20-40 minutes or so to actually delete the files (put them in the trash). I am wondering if the slow performance is normal? I previously used this drive with a direct connection to my MacBook Pro with the firewire cable. Another thing that is curious is that the folder I was deleting was a backup of my old 'Applications' folder (which does not appear to contain many files - maybe 100 icons at the most). Could the usb cable be the culprit (perhaps is only designed for USB 1.1)? It appears quite a few other people are having some similar issues with drives connected to the usb port. Any other ideas? Thanks.
MacBook Pro 2.33 ghz Mac OS X (10.4.8) Airport Extreme, Airport Express

I have ruled out the cable as the problem. I attempted to delete another folder and it took well over 1 hour to tally the files so I gave up and clicked the cancel button to cancel the process. As an experiment I used the same usb cable to directly connect to the MacBook Pro and the folder was deleted in less than 30 seconds. There is definitely some issues with the USB port. Hopefully Apple can resolve this with a firmware or software update.

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Incredible slowness with LaCie 250 usb drive when trying to delete files

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