i am using ACAD2008, the cad was slowly in start-up, since the drawing have xref file(s) (even overlay and attach). in the command line, it show the xref was reslove sometime or "open c://..path//...", the cad still runing but it spend a long time processing or loading the xref-file.

Have your xref size grown?
 
It may be caused by this:http://www.cadforum.cz/cadforum_en/qaID.asp?tip=5871

it seem the xref file size remain the same (not suddently be large).
and, thanks for your link. and i try it as soon.
 
it work, and thanks for your help.vaa132008-04-11 08:44:22