2D preformance on a 30" inch monitor

Hey
We have some trouble with 2D performance on a 30" inch monitor. When we try and move objects in the program (2D cad design program) it will render the movement very slow.
The users that are experiencing this problem have a 2 screen setup, one 30" (primary) and one 22" screen. When we set the secondary (20") as primary screen and the cad software is launched on that screen it works. We can the move it to the big screen and it also works.
I think this is a software problem with the cad software, but wanted to check if someone have had the same problem here.
The computer have the following spec:
Thinkstation S20
Xenon 5540
SAS 147 GB Disk
Quadro 1800
4GB Memory
WinXP 32Bit
Have tried lastest driver form lenovo and nvidia.
Thank for any help.
Best regards
Håvard

either the FX 1800 doesn't have enough bandwidth to display your file while handling two monitors simultaneously or your CAD software is missing an accelleration setting to allow the FX 1800 full processing power.
i had an FX 3700 work very slow in photoshop CS4 while trying to manipulate a 400 MB 2D image on my 30" NEC. i attributed that to slow bandwidth more than i did a lack of memory.
what software are you using and how large is the file?
ThinkStation C20
ThinkPad X1C · X220 · X60T · s30 · 600

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