Hi no1-cherrypicker,
My name is Roger W, an independent advisor trying to help. "This is an interesting capability. Turns out this is provided to help troubleshoot issues in using multiple processor(s, or cores, most likely) during boot. By default, all Processors/Cores are enabled. So if you exercise this option, it can only be to REDUCE CPU capabilities. This is one of those "best left alone" settings, IMO -- though you can play with it if you like"
More information here:
https://www.tenforums.com/general-support/10663...
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
Let us know if the solution above works for you.