Image lags/choppy when scrolling to zoom

Illustrator CS 5.5 - Whenever I scroll to zoom the image resizes with considerable lag and choppyness. The file is only 1.2 mb and vector. I am able to move within the window with the arrow keys up and down ok but zooming is painful. I spend too much time adjusting both ways until I get it just right. The same image in Photoshop CS 5.5 resizes very smoothly. I have tried OpenGL and profiles but to no avail. Does anyone have some words of wisdom to help? There is no way that the hardware is slow, the video drivers are the latest, Win 7 all updates, and CS5.5 is up to date as well. Also, it works just fine on another system that is about a basic desktop using CS 4. Smooth zooming.
System is maxed out - 24 GB RAM, Quad Xeon 3.7 processors, 2 TB 7200rpm hard drive, Nvidia Quadro 5000 2.5GB
Thanks for any advice.

I can't imagine it would be your system seems like a pretty forceful box.
Have you tried things like trashing the settings folder or resting the preferences?
I am on a Mac pro original way behind what you hav but all functions quickly and here is whaT a 6 mb file looks like zoomed in at 400%
I thin pretty sharp nd it zooms rapidly. Open GL does noT work in Illustrator as I know. So you have to click or drag a Marquis over an area.
But I think it should be working pretty snappy on you unit.

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\- Ray

Image lags/choppy when scrolling to zoom

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