Purge
The data from an AutoCAD drawing consumes the resources on a IT system. Therefore you must regularly remove unnecessary data from a drawing. You do this with the PURGE command. In older version before 2000 you have to write PURGE in command line, at the prompt "do you want to purge all objects? Type Yes, enter. In newer versions, you use a dialog box, selectively you choose what kind of objects you want to purge. Only use purge when the drawing is complete. Else you might remove layers or textstyles that you wanted to keep.