'Fails' is a bit harsh. Since when was it decreed that Google should make all of their web pages blazingly fast on mobile? Al Gore didn't pass any laws on that.

'Fails' is a bit harsh. Since when was it decreed that Google should make all of their web pages blazingly fast on mobile? Al Gore didn't pass any laws on that. If Google make a developer oriented tool then it is no surprise that it works brilliantly on the desktop and slightly sub-optimally on the mobile phone. I am quite useless at web design yet I can game Pagespeed to get 95% or higher in the score. Of course the javascript will be mashed into some black hole that can't be un-minified and the way things load will not be well suited for the visitor seeing more than one page (using cached things). I can't believe someone at Google could not have done what I do to 'game' Pagespeed. The fact that they haven't is good, you should never let scores from things like Pagespeed or YSlow determine how a web page is delivered, it is like using a 'defeat device'. I do wish they would do something to Pagespeed as they have changed what it does over the years and the latest iteration didn't excite me, I preferred the previous one, in part because you could run it against 'localhost'.