When idle cpu usage should remain low.
Occasionally when idle I notice that see my cpu go to 100% (I notice because my CPU fan starts going)
This is when I am not actively using docker - its just running in the task bar. Closing and restarting makes the issue disappear.
Docker for Mac: version: mac-v1.12.0-beta18-3-gec40b14
OS X: version 10.11.5 (build: 15F34)
Steps to reproduce the behavior
I cannot reliably reproduce this - but I have seen it on several occasions.