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If you ever plan to use any of these older PCs: Disable Spectre and Meltdown mitigations! As a bonus you should also remove CPU microcodes from the BIOS/UEFI and make sure that no microcode is loaded via software.

The performance gain is huge if done correctly. There is no need for these mitigations on homelabs.



You made me try this, my cpu went from 16% to 9% on my proxmox-box running a home-assistant vm and a few lxcs. Thanks for your post.


This is an excellent advice! I did that on a few of my machines few months back to reduce heat, power consumption.


Any guides on how to do this?


Usually it's just a bios option you can turn off.




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