CPU Usage when idle

Unity Engine
1

After playing the first tutorial, I noticed my laptop was noisy. I kept hands off the mouse and keyboard, waited for a while and still found CPU running at almost 30%.

I closed all tabs (scene, hierarchy, inspector, game and project) and left only the tutorial’s one (see attached image), and CPU was still working on something invisible.

Unity is in Edit Mode, not in Play Mode.
PC is a Lenovo Z50-75, 16 Gb RAM, 1Tb HD, with ATI Radeon R7 FX-7500.

What can I do turn Unity idle “when idle”?

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2

Sometimes CPU thread get locked, and not released correctly, causing CPU usage. +General accumulative memory leak. Best you can do, is restart Unity periodically.
I don’t know when exact such issue happens. Sometimes quite randomly. But mostly of the times, work well.