New Feature: Is Site Responsive?

Is there a way to determine whether the site being tested is responsive. This would really be beneficial when looking at page weight desktop versus mobile, and things like images.

Post here explains how to do this using WPT:

http://www.guypo.com/roughly-1-in-8-websites-is-responsive/

I am thinking that adding a field that says Responsive: yes, no would be a welcome addition to the test results.

Thoughts?

It’s not the kind of thing that I’d want to run on every test because it adds a fair bit of time to the test and it’s not something that tends to change from day to day.