Under certain circumstances, AutoCAD's undo command becomes very sluggish. This is frequently caused by a dead end windows shortcut somewhere in the support path or in the locations specified in the ACADDRV, PrinterStyleSheetDir, PrinterDescDir, PrinterConfigDir environment variables or any other location that AutoCAD is configured to search for files.

Workarounds: The most common dead end shortcut is the "Add A Plotter Wizard" which can be found in the directory specified by environment variable PrinterConfigDir. You can retrieve this variable with the following AutoLISP code.

(GETENV "PrinterConfigDir")

Find the offending shortcut and either delete it or point it to a location that everyone will have access to.

Often, this is caused by inexperienced CAD Managers copying the entire PrinterConfigDir from their C drive to a network location. Regardless of their experience level, there really is no practical reason for AutoCAD to search within the PrinterConfigDir when executing the UNDO command or any other command not related to plotting

First Appeared: AutoCAD 200?
Status as of 2008: Still occurs.
Status as of 2009: (unknown - please email with any info)