I’d say: You’ll waste your time. Because you’ll run into this situation again and again and you don’t want to install every time a new system. It’s a good time to start learning. Did you look at the tools mentioned above?
What is your system load? What about the values @ruff suggested to check? What about your clockspeed as @mladen asked?
Last time I had this situation it had been a gnome util running wild, because it couldn’t get update information about gnome shell extensions. These things happen and from your writing, you’re the type of person that want to take the responsibility over her system.
Good technicians are here to learn from, keep them entertained 
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