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will it be lighter on the CPU?
Seems unlikely it can get any lighter than the 0.14% CPU load average 5.27.10 is using right now
hmm strange, maybe some applet but when I was using it on my 3rd gen i7 laptop it never went silent and the CPU usage could spike to even 20% when idle
Maybe something wrong with the GPU in your setup?
I could see kwin using a lot more CPU if the compositing fell back onto software rendering instead of hardware rendering
3rd gen i7 is outdated
Even a 8th gen i7 struggles to keep cool and quiet compared to Ryzens from 2019 onwards running the same stack
I'd go with some applet as the culprit. I use a Haswell i7 laptop and it's quiet
I run Plasma 5 on a 2nd gen i7 laptop and it's idling just fine and quietly most of the time with no such spikes unless I have several apps running, including a web browser with a plethora of tabs.