Created attachment 1032279 [details] top Description of problem: I have a laptop with a Core 2 Duo T7200 CPU. Plasmashell process in idle is using an entire CPU core at 100%. All desktop effects are disabled Fedora 22 - Kf 5.10
Created attachment 1033373 [details] console output To retrieve some infos, I killed plasmashell process, then started it again using command $ plasmashell -d all
The system monitor widget triggers the high CPU load (see upstream bugreport)