Slow performance from externally attached drive to server

We have a new 2TB external drive connected via USB to our server running 10.5.5. For some odd reason, some users are getting the beachball of death when connecting to certain folders on this volume. I'm able to connect via my machine running 10.5.x, but it takes upwards of a minute to simply display the folder listing. We don't have a FW 400-to-800 cable, so we can't hook it up via firewire.
This is one of those new 2TB MyBook Western Digital external drives, which we've found to be a bit flaky. So, that could be the problem.

USB is the worst possible interface for external media. It is slow and will always be slow, so that's one factor.
A second contributor comes with folders that contain many files (e.g. thousands). The Finder has a real problem reading that many files in one directory, even off a direct-attached disk, and that problem is exacerbated over a network connection.
Put the two issues together and you almost have a worst-case scenario. Moving to a faster interface such as FireWire will help, but if that's not an option, reorganizing the data into fewer files per folder may be your workaround.

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