CAD software takes up too much memory. This is generally the case because in the process of drawing, various "blocks", "layers" and styles need to be established. With the revision of the drawings, many of them are useless, but they are still hidden in the documents.

It's actually quite simple. Enter the shortcut key "PU" (clean command) at the command line, and then click Clean All. If the dialog box to confirm cleaning pops up, click Yes to All, and then "ctrl+s" to save the file.

The two options displayed in the drawing box must be checked, and the file memory should become smaller after cleaning.

I hope I can help you, and I hope to adopt the answer.