This Modern Setup Host High CPU usage is one of the most common error and occurred while installing a Windows feature update. Whenever the system gets some major updates once in a year, this process might appear on the screen. However, it often causes some glitches and high usage of PC resources like CPU or disk. Unluckily, this issues is quite common among various users and creates lots of other problem for Windows 10, 8, and 7 users. Source :- Related article :|||||