There are too many modules started in CAD, and the more modules started, the longer the startup time and the larger the memory occupied. The solution is as follows:

1. First, open the CAD software in the computer, as shown in the figure below.

2. Then Enter the command: PU in the command window, and then press the "Enter" key, as shown in the figure below.

3. Then check "OK to clear all items" and "Clear nested items" in the window, and then click "Clear All", as shown in the following figure.

4. A prompt window "Clear Label Style" appears, and click "Clear All Items", as shown in the following figure.

5. In this way, some redundant files in CAD are cleared, that is to say, "Clear All" becomes a gray clickable state, as shown in the following figure.