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https://forums.flightsimulator.com/t/increase-performances-immediatly-amazing-tested-and-aprouved/504551/79
Disabling the NDU registry might help because NDU will no longer be scanning for new devices all the time. This saves both computational power and system resources like memory usage. To disable NDU,
Open the Registry editor app again and navigate to HKEY_LOCAL_MACHINE/SYSTEM/ControlSet001/Services/Ndu.
Find and Right-click on the Start option and click on Modify.
Change the value from 2 to 4 and click on OK.
Now, restart your computer and check if the Windows 10 high RAM usage issue persists.
If you’re unable to use the internet after changing the NDU values, revert to the default value, i.e., 2.