Cortana makes the CPU beat faster: Latest Windows 10 update leaves some processors hot under the cooler
https://www.theregister.co.uk/2019/09/03/windows_10_cpu/
Updated Some Windows 10 users are experiencing alarming CPU spikes following last week's optional cumulative update.
The problem patch, KB4512941, was released last week as a update for Windows 10 1903 (aka the May 2019 release.)