Hi
I had the same issue and solved it by setting 2 variables in these files:
/etc/systemd user.conf and system.conf
Changed:
LogLevel=info to LogLevel=err
and DefaultLimitCPU=50%
CPU limit was blank and commented out.
After this change, ‘systemd init’ and ‘systemd -user’ processes does not even register.
Another symptom I had was file-browser (dolphin) will go stale on ‘refresh’, slowing down basic file browsing tremendously.