After installing the March 12, 2020—KB4551762 you might encounter high CPU Usage with process VMMEM if you have Hyper-V Services enabled, an Easy fix is to go to Apps & Setting and uninstall reboot then reinstall the features this will flush the stored cache
procedure for rapid execution of app launch / service launch.
NOTE: After Uninstalling and reinstall Hyper-V Features give it a few minutes to re-index in the system catalog & One more thing reboot once more if using App Guard Sandbox features, if not you will get an error.
Happy Computing folks...Also scrub your hands as a safety procedure as well as do routine hygiene to keep your system healthy. Be Safe & take care.