CPU load when idle on Linux

I have Kodi installed on a Gigabyte Brix with the following setup:
CPU Braswell N3150, 4 GB of RAM
Ubuntu 16.04 LTS up to date at 23-Jan-2017
Kodi 16.1 Jarvis with Confluence skin
Kodi 17 RC 3 with Estuary skin (not together, but tested with both)

With both versions of Kodi, when the system is idle Kodi CPU usage is always about 15% to 20%. The same version of Kodi installed on a Macbook pro 13″ (late 2013 2.4 Ghz model) takes up to 5% or 6% CPU when idle.

Is this normal? Anyone with a similar setup can confirm that this CPU usage is not too high for some reason? I’m aware that the N3150 is less powerful than the i5 in the Macbook, but maybe someone can confirm this findings.

Thank you all!