&#x27;Fails&#x27; 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&#x27;t pass any laws on that.<p>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&#x27;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&#x27;t believe someone at Google could not have done what I do to &#x27;game&#x27; Pagespeed. The fact that they haven&#x27;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 &#x27;defeat device&#x27;.<p>I do wish they would do something to Pagespeed as they have changed what it does over the years and the latest iteration didn&#x27;t excite me, I preferred the previous one, in part because you could run it against &#x27;localhost&#x27;.