6-8% CPU usage when in idle

I wanted to create desktop app for mac/linux/window.
But for empty project I got around 6-8% cpu usage on macbook pro.
My openfl version is 3.6.0, lime 2.9.0.
Is main loop so CPU intense? Or there is some way to fix it?

What kind of CPU do you have, and how many cores?

Macbook Pro
2.6 GHz Intel Core i5, 2 cores
OS X 10.11.3

is it still a problem from long time ago?