When I test facebook with google PageSpeed Insights, I am getting highly inconsistent results. It gives different result for http://facebook.com, https://facebook.com, www.facebook.com, ... and also sometimes it is showing different result at different time for the exact same url. (The results are shown very poor most of the time and facebook it is)
Why is this happening?. Is it facebook behaving differently at different times?.
Refer the page Why does the performance score change from run to run? I didn’t change anything on my page!
Variability in performance measurement is introduced via a number of channels with different levels of impact. Several common sources of metric variability are local network availability, client hardware availability, and client resource contention.