While an object with a Collider or Light component is selected and the Tools panel is active, there is constant high CPU usage (even if the Editor window is minimized).
In case if tools panel is disabled or object with any other components (that doesn’t add additional buttons to this panel) is selected, there is no CPU usage at all.
It looks like some bug with displaying additional buttons on tools panel.
It’s not some critical bug or something. I just noticed this and had to let you know about this, guys
I’ve updated from 6000.0.23f to 6000.0.25f Unity version and can’t reproduce this anymore. So, seems like this bug is fixed.
Update: During testing, I found a similar issue. When an object with a Configurable Joint is selected, the same infinite CPU usage occurs. It doesn’t depend on tools panel. It occurs even if Scene tab is closed.