Hey @kovacslt great that you are back with your independent assessments.
However I did measure some things…
That is ubuntu standing still at idle with no apps…
… so in my assessment they fully deserve the lowest ranking. Please let us know when you find anything more inefficient than these Distros. 
When you get around to installing Trisquel you enter a new world of performance born of efficiency whether on a modern powerful 16 core mega RAM machine with Trisquel pre-installed or your very eco friendly second hand NVIDIA graphics card 
… respect 