How can CAD reduce the file size?

The method of reducing file size with CAD.

Please refer to the following:

1. Enter "pu" in the cad command and press Enter.

2. A dialog box pops up and all of them are selected.

3. Click Clear All to clear all items.

4. Create a new DWG file and name it test.

5. Select all the graphics in the original file.

6. Click Copy to copy the selected drawing to the new drawing (test. DWG file).

7. In the new chart (test. (DWG file), click the original coordinates and paste.

8. Paste and save.

9. The cleaned graphic file size is 260k, which is obviously smaller than the original file size.