How do I disable all the Spectre and Meltdown mitigations in Windows 10 1903?

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I have a suspicion that one of them caused a performance regression in an application and I just want to test that hypothesis by disabling these fixes and comparing numbers.


However with the Microsoft guide and the registry tweaks or with InSpectre I can't disable all of the mitigations.


In fact I've found no way to disable L1TF (Foreshadow) and SSBD (Spectre v4) mitigations specifically, only Meltdown and Spectre v2.


Is this something that's hard-coded or are there methods of disabling these?


Thanks

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