Drawings-Zoom in-out

Any ideas why large drawings zoom in and out slowly and jerky when
using the mouse wheel
and smooth and faster when using the zoom in/out icon. I have a
Logitech wheel mouse, SW2005-sp3, Nvidia Quadro4-980xgl-128 meg card.
Wheel zooms seem to be instant on
our Proe WF2 drawings. Any ideas would be appreciated.
Reply to
tjones2
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