[alecmg]

Phoronix regularly tests this, search for keyword mitigations

https://www.phoronix.com/review/amd-zen5-mitigations-off

[lnx01]

I ran mitigations=off on my Zen4 until I saw that phoronix article and realised that in most workloads it made essentially no difference, and even harmed performance in others. I no longer run mitigations=off. But on my old i7 7700HQ mitigations=off improved performance by 10-20% depending on workload.