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Several operations are supported: login, logout, pagination, posting I think are.

I think you're just seeting processes that are spun up as part of normal operation: for instance, a short-lived process is spun up every time a password is hashed.

You wouldn't see them under low load because they aren't used much there.

which guide are you following?

Looks like you're using root to run the npm command. It is highly recommended to NOT install or run NodeBB as a privileged user.

You want to use nodebb-plugin-customize

I suggest you look that up. You don't need to create the directories through the command prompt, but you can if you want to.

IIRC guests are not counted for topic views.

It used to be that you had to upgrade in multiple steps, but not anymore. You can upgrade directly from 1.12.0 to 1.13.2

Make sure you backup your database

You should not be installing or running NodeBB as root. You should not be running npm as root, that is what is causing your issue.