Very Slow SMB Performance with DroboShare

Hi there,
We have a big issue with a DroboShare NAS device connected to a Drobo Drive (FAT32):
If we connect to our DroboShare NAS directly via LAN, the performance with SMB is terrible. Browsing folders takes minutes until the contents (15 items) are shown, opening and saving files takes minutes.
If we connect the Drobo via USB to one of our Macs and then share it via SMB, it is fast as ****.
Problem is that we cannot leave it this way, as we only have portable macs, so if they are removed, nobody can access the Drobo.
The problem nevertheless seems to be restricted to Macs: If we connect to the DroboShare with Linux or Windows Boxes, everything is as fast as expected.
Does anyone has similar issues with weak performance and/or knows how this can improved?
Any help is greatly appreciated.
Thanks,
Simon

I just ported netatalk (AFP) over to the DroboShare.
http://code.google.com/p/drobocapsule/

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