Sets FeatureSettingsOverride = 3 (and writes the matching mask) under Memory Management, turning off the Spectre/Meltdown speculative-execution mitigations. On older CPUs this can be a sizeable speed-up; on recent CPUs the mitigations are cheap, so the gain is small. EXPERT: this removes protection against a class of side-channel attacks — only sensible on a single-user gaming PC you trust. 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 MaxTweaks