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Here is how we fix problematic drawings:Open with RecoverAll Audit & PurgeWblock the drawing using a window to select objects. NOTE: It is extremely important to not use a crossing window, type All or use "Entire Drawing", as these can all bring the errors over. If you have multiple layout tabs, you will need to wblock them out to separate CAD files and merge them back together.Open each drawing and audit and purge againMerge drawings back together as neededUse the code posted earlier in this thread to remove anonymous groupsUse the overkill command to remove any overlapping lineworkRemove any unused annotation scale listsAudit & Purge againNOTE: About purging, make sure that you purge Regapps as well, this can only be done with the -purge command or a LISP routine setup to do this.Yes, this is an annoyingly long list, but this works 99.99% of the time and you will end up with a good drawing that doesn't slow everything down.