On a secure system (not serving to the Internet, and all trusted local users), you can add "mitigations=off" to greatly improve performance.

https://fosspost.org/disable-cpu-mitigations-on-linux

This depends on the CPU. From the article you linked:

> some CPUs like those in the AMD 7000 series can actually give a worse performance if mitigations are turned off.

Due diligence!