Don't forget to disable all "spectre and friends" mitigations in your linux kernel, and some workloads will become much faster.

Can you do the same on the windows kernel or apple kernels?

Yes you can do the same on Windows.

https://www.grc.com/inspectre.htm

Only really on CPUs with the vulnerability

Interesting, did not know you could do that but it does make sense. Make sure it’s air gapped.