AutoCAD 2008 User's
Guide > Share Data Between
Drawings and Applications > Reference Other
Drawing Files >
Increase Performance with Large Referenced Drawings
There are several features that can improve performance when dealing with large referenced drawings.
Provides a high-level description of using demand loading to improve performance when working with large referenced drawings.
When a DWG reference (xref) is unloaded from the current drawing, the drawing opens much faster and uses less memory.
With demand loading, only the data from the referenced drawing that is necessary to regenerate the current drawing is loaded into memory.
When you turn on demand loading with copy, you can control where copies of externally referenced drawings are to be placed.
