If you are struggling with marginal system resources and wrestling with a large drawing containing an abundance of hatched areas, Autodesk has provided yet another simple little performance trick to help us out.
The system variable, HPQUICKPREVIEW, controls the automatic preview of a selected hatch pattern as you move the cursor across a closed area. This is a good idea but unfortunately is known to cause performance issues in large, complex drawings.
Again, it’s a handy tool so don’t turn it off unless… you are experiencing performance issues. Performance issues? Is that vague enough?