Wow what bee hive I stir up!
Sorry I have been reviewing shop drawings with the old fashion cad program called a red pencil and not check in here.
The reason for the detaching of xrefs is simple not really about the performance drag on Autocad. We have to share.
Our xrefs and along with everyone's xref are uploaded to BuzzSaw at least once a week if not more. Per clients cad standards, we must detach all xrefs prior to uploading. Afterward we reattach the xrefs after or just prior to WebEx Phone/Internet coordination meeting
For instance I have 17 xrefs that I have to attached for the coordination meeting. In order to do this, I have to go hunting and pecking in folder that has 209 xref files. If it was not for the required detaching, yes unloading would work fine and Glenn's proggy would be the cat's meow.
Thanks.