Thank you for bringing this to our attention, let me help you on this matter.
I understand that after BIOS update the processor usage has increased.
Allow me some time to do a research on this matter and I will update this thread as news become available.
Thank you for your time.
Thank you for your patience.
I have been testing BIOS version 0042 on same Intel® NUC model but I did not get same issues previously reported.
The only difference was the operating system was fully updated to version 1709
Please test updating the operating system here
Let me know your findings.