Created attachment 102838 [details] screenshot top and applet See attached screenshot. My 4 cores run at full speed (compiling Qt) but the applet shows ZERO CPU usage - just the memory bar changes a bit. Even hovering over the applet shows "CPU 0%" in the tooltip
I found out that it only shows 0% CPU if I have activated to show separate bars for each core.
This was fixed with the patch https://git.reviewboard.kde.org/r/129838/
*** Bug 366324 has been marked as a duplicate of this bug. ***