that's the story of w7 i think. did you check the resource meter? the last time i checked all core are unparked by default.

ok that page doesn't state that it's for w10 or not. (posts looked old to me) i'm not sure if the values used to control cpu core parking have been changed in w10.

in my case, there is nothing indicating the cores are at parked state in resource meter. (running on high performance power profile)