https://wccftech.com/microsoft-delivers-new-windows-10-cumulative-updates/

Microsoft is rolling out another batch of Windows 10 cumulative updates, bringing fixes to the Start menu and addressing the high CPU usage issue, among other improvements. The updates are available for Windows 10 October 2018 Update, April 2018 Update, Fall Creators Update, and the Anniversary Update. The company hasn't delivered any new update for the latest Windows 10 May 2019 Update, version 1903.

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\BamThrottling