Hey, what I would suggest for starters is to find where the CPU draining happens. Try running gdb --pid `pidof plasmashell`, wait for it to load and type "thread apply all bt", then type "continue" and after a bit hit ctrl+c and type "thread apply all bt". Maybe it will give some interesting information on where it is stuck.
If you don't have plasma built from source, then make sure you install debug packages for plasma-framework and at least plasma-workspace. And also Qt. Cheers -- Martin Klapetek | KDE Developer
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