CPU usage doesn't match

CPU total about 30-40%, but in program list about 5-10%. What is the problem?

check with htop

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It could be that KDE’s System Monitor only shows you user-run GUI applications, while hiding background and root/system processes.

This might be why adding up all the “Applications” doesn’t account for 30-40% CPU usage.

The culprit for such a high CPU use might be Xorg or plasmashell

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The Overview tab only lists graphical applications opened by the user. Use the Processes tab for the complete list.