[miguelcmran]

I'm sorry, where I put "script.skin.helper.backgrounds" I meant "skin.helper.services"

"script.skin.helper.backgrounds" is corect.

You can reduce number of "wall images prebuilt" default is 20 for all content....reduce in settings for this addon on 2.When prebuilt all wall image your cpu will back on normal.
Or disable this addon

settings for script
 

 It was the "skin.helper.service" and not the "script.skin.helper.backgrounds". For some reason in Libreelec, OSMC, and any distribution based on Kodi for Raspberry, makes the CPU consume 360%, between 80-85% each core. I had to activate the Estuary skin in order to disable Eminence and that way I could uninstall the "skin.helper.service". Later I re-activated the Eminence skin and put it as the main skin. That way the Raspberry CPU is between 10-30%.