AutoCAD LT :: Crosshairs Get Slow And Jumpy Near Dim Lines?

when working at this workstation, the crosshair gets very 'Jumpy' and slow as it gets near or cross over a dimension line. is there possibly a setting that is on or off that is causing this. It has nothing to do with the file. It happens on any file on this computer, but if i switch to a different workstation all is well. And this is a much faster workstation than the other. The issue also happens to a much lesser extent when crossing any drawing object. The cursor (crosshairs) will pause slightly. It is a very long pause when near the dim lines though. it is almost impossible to select or snap to an object or line if it is near a dimension line.