Whonix 15: increasing allocated CPU number makes the VM incredibly slow

[HulaHoop]

@onion_knight

I noticed my Whonix 15 Workstation was incredibly slow: slow boot, very slow reaction times, whatever I would do (simple terminal tasks, browsing, etc.), everything is slow and almost freezing, although I have allocated 4GB of RAM and up to 4 CPUs.

That’s because I use CPU pinning by default to isolate VM CPUs from eachother to prevent side-channel attacks on crypto if there is a vuln in OpenSSL. So even if you add more cores you are essentially overloading a single real one with this setting until it is removed.

To get rid of this behavior remove the

cpuset='1'

in the vcpu tag.