Because the CAD file is too large, the opening speed is slow

The CAD drawing just made, the file will be very large after saving the file. How to deal with this kind of imagination?

Description of the problem: I just learned CAD drawing. I painted an office construction drawing according to the assignments arranged by the teacher yesterday. It is very slow to get back to the school. Sometimes I can start playing, sometimes I can’t open it. The teacher said The file is too large, so it is slow to open. What should I do?

Processing: This is because the generated CAD drawings contain a large number of irrelevant tiles and some garbage, resulting in a large file size. You can enter pu in AutoCAD, press SPACEBAR or ENTER, a cleanup box will pop up, select “Clean all”, clean up irrelevant tiles and some garbage, and save, the file size will be higher than before. A lot smaller. In the future, it is fine to clean up the garbage from time to time. The file cannot be opened because the file is too large and the school computer configuration is low. At this time, you can try to press the Esc key to skip some errors when reading because the file is too large.