Sparse bundle mounting from NAS drives very slow

I have an unusual problem, where one of my user accounts has recurrent trouble mounting large sparse bundles located on NAS drives. The sparsebundles are hard drive clones, 200-250GB sized. NAS connected by gigabit ethernet.
On trying to mount an image with Finder, there is a pause, lasts 2-3 minutes, then the image mounts, and quite often Finder then goes unresponsive. Relaunching Finder then seems to fix the problem, at least temporarily....
Unmounting the sparsebundles takes 2-3 minutes also....
Two other user accounts I have, one on same hard drive as the affected one, work well, the same sparsebundles mount/unmount instantly....
Yesterday deleting Finder prefs fixed the problem, but then today the problem was back.
This is obviously a Finder issue, connectivity to the NAS in question is fine for other files, even for a 300GB .dmg image, just sparse bundles seem affected....
Any ideas?? It's driving me nuts now!

I too am having this issue. Intel / 10.5.8 attached to an SMB share from Ubuntu Linux.
I ran a test of various image types, and while Sparse Image works, Sparse Bundle fails. Here are my logs. Happy to do some testing and log posting if anyone has a test theory to try.
9/5/09 2:20:29 PM Disk Utility[1822] Disk Utility started.
9/5/09 2:22:38 PM Disk Utility[1822] Creating Image “test1-rw-disk-image.dmg”
9/5/09 2:22:38 PM Disk Utility[1822] Initializing…
9/5/09 2:22:38 PM Disk Utility[1822] Creating…
9/5/09 2:22:39 PM Disk Utility[1822] Formatting…
9/5/09 2:22:39 PM com.apple.KernelEventAgent[37] KernelEventAgent: sysctl_queryfs: No such file or directory
9/5/09 2:22:39 PM Disk Utility[1822] Attaching…
9/5/09 2:22:40 PM Disk Utility[1822] Finishing…
9/5/09 2:22:41 PM Disk Utility[1822] Image “test1-rw-disk-image.dmg” created successfully.
9/5/09 2:23:21 PM Disk Utility[1822] Creating Image “test2-sparse-disk-image.sparseimage”
9/5/09 2:23:21 PM Disk Utility[1822] Initializing…
9/5/09 2:23:21 PM Disk Utility[1822] Creating…
9/5/09 2:23:21 PM Disk Utility[1822] Formatting…
9/5/09 2:23:21 PM com.apple.KernelEventAgent[37] KernelEventAgent: sysctl_queryfs: No such file or directory
9/5/09 2:23:21 PM Disk Utility[1822] Attaching…
9/5/09 2:23:23 PM Disk Utility[1822] Finishing…
9/5/09 2:23:24 PM Disk Utility[1822] Image “test2-sparse-disk-image.sparseimage” created successfully.
9/5/09 2:24:04 PM Disk Utility[1822] Creating Image “test3-sparse-bundle-image.sparsebundle”
9/5/09 2:24:04 PM Disk Utility[1822] Initializing…
9/5/09 2:24:04 PM Disk Utility[1822] Creating…
9/5/09 2:24:04 PM Disk Utility[1822] Formatting…
9/5/09 2:24:05 PM Disk Utility[1822] Finishing…
9/5/09 2:24:05 PM Disk Utility[1822] Unable to create “test3-sparse-bundle-image.sparsebundle”. (Operation not supported)
9/5/09 2:24:05 PM Disk Utility[1822]

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