Slow thumbnails

hello All,
I am running LR 3.5 on a virtual XPpro with 1.6gb of ram.
This XP is dedicated to LR, so there is nothing installed, not even an antivirus.
The network is gigabit.
While it is snappy with my local raw files, accessing raw files on a samba server on my local network is a nightmare because it will take ages.
The samba server has 12000 19.4MP DNGs (113MB each), divided into six folders each with 2K files.
Although I set up the catalog to automatically discard 1:1 previews = never, each time I open a folder I only see grey thumbnails.
If I wait, the screen will slowly populate, but thumbnails are not recreated if I do not page down, so I can't just leave the pc on all night long and be done with it.
Already tried to delete the preview folder, with no success.
As far as I remember, when I started this project it was working fine, but something must have gone wrong with some LR update... guess what.
Any ideas?
Thanks for reading...
-Gian

Hi Kelvin
i'm using OS WIN7 Professional, DELL PRECISION 5500 workstation Intel(R) Xeon(R) CPU [email protected] Memory 48gb DISPLAY NVIDIA dual 2GB QUADRO 4000  Driver 320.78
i have no problem when using 6.0.3 only it's happen at the latest 6.0.4 and 6.0.5 please check the youtube link i post for your reference thks
http://www.youtube.com/watch?v=7TrOgrl4jIU

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