How would one go about changing QoS for the system daemons and would it require disabling SIP? I don't see anything relevant in launchctl's man or launchd documentation, really interested to try it on the system VPN service.
In that specific case, it was our own installation of a VPN client and a custom definition of its launchd configuration. I don’t remember the exact details anymore.
I’d expect the system-provided services to be correctly configured by Apple in this regard.
I’d expect the system-provided services to be correctly configured by Apple in this regard.