Companion to the mitigations tweak above — sets FeatureSettingsOverrideMask = 3 so the override actually applies. Harmless on its own; apply it together with 'Disable Spectre/Meltdown CPU mitigations'. Reboot required.
MaxTweaks applies this tweak with one click and snapshots your original setting first, so you can revert it cleanly at any time. A System Restore point is offered before batch changes, and every tweak links to its official source.
Get MaxTweaksOfficial documentation: https://support.microsoft.com/en-us/topic/kb4073119-windows-client-guidance-for-it-pros-35820a8a-ae13-1299-88cc-357f104f5b11