How many cores does MineOS use?

I am planning on doing some other things with my server computer, and I want to know how many cores MineOS uses, I know that Minecraft uses one core, but I want to know if the WebUI uses another core, or anything else. Thanks!

The answer to your concern is probably bigger than simply stating that “MineOS uses one core”.

But, MineOS, as a nodejs application runs one a single core.