My cpu is used a lot and my fan is spinning always hard even when I close all my apps. When using system monitor I found Xorg and kwin_x11 using a lot of cpu with all my desktop effects disabled.
Another process is also consuming cpu called kworker/u4:2-events_power_efficient but less than xorg and kwin.
I found also the following error in .xsession-errors which is repeated for many handred times

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plasma-nm: Wireless scan on "wlp7s0" failed: "Scanning not allowed at this time"