I have seen this sporadically across many CUPC versions. I have opened TAC cases on it but have never been able to pin it down to a defect. If you look at the individual CPU cores, it typically pegs a single core (apparently not multi-threaded).
The odd thing I have noticed is it eventually seems to stop doing this. Typically a week or two after initial install on a workstation that experiences this, the behavior seems to evaporate.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.