Google PageSpeed Insights User Experience beta

Google has extended its PageSpeed Insights tool to include machine tests for aspects of the quality of mobile UX.


  • Google has extended its PageSpeed Insights tool to include machine tests for aspects of the quality of mobile UX.
  • Suggests that future PageRank algorithms will increase their onus on UX, in concert with query relevance.
  • Currently in beta and does not affect your score.

Why should you care?

Search Engine Optimisation

Whilst this is currently in beta, and does not count towards your score, it suggests that Google is considering increasing the onus it places on UX when considering whether to serve your content in a SERP. I assume that this means that the PageRank algorithm will eventually be updated to down-weight results from sites that do not render properly, or perform poorly, on mobile devices.

Conversions and Competitive Advantage

Building a site or application that is perceived to be fast to download and to render will dramatically affect conversions and experience.

The latest data from a 2014 Radware Report, suggests that 57% of users abandoned pages that took longer than three seconds to download (median download time was 5 seconds). Furthermore, the median load time for the top 500 eCommerce sites has slowed by 21% year-on-year.

Consequently building sites and apps that are fast and which are optimised for mobile use will help place your content ahead of the competition; both in practice and in Search.

It’s just good practice

Ultimately serving content in sympathy with user tasks, scenarios and contexts of use is just good web publishing practice if you want to succeed on the web.

In this regard, web performance for UX is similar to factoring for the needs of diverse users and their accessibility requirements. It’s simple to do, guidelines, like WCAG and BS 8878, exist to provide practical assistance in compiling with best practice, the benefits are likely to extend across many audiences and they may be expensive to retrofit.

What does PageSpeed Insights UX beta test?

Firstly it can only test structural attributes that are easily understood by machines and so the usual caveat applies…

  • be careful with literal interpretations of any recommendations
  • remember that machine testing can’t check for content or subtle usability issues


Size tap targets appropriately

I assume that PageSpeed Insights uses an interpretation of Fitt’s Law to check whether the links or buttons, on your webpage can be easily tapped on a touchscreen. This aspect of mobile UX is similar to factoring access issues, like motor-control impairments, or use-case scenarios, by ensuring that the interface is operable through suitable target sizes for its controls.

Avoid plugins

Essentially: you will be penalised if you place the burden on the user to find and install Flash, Silverlight, Java or any other proprietary software to serve your content. This suggests that Google advocates the use of native and open web technologies, like HTML5, to support rich media across all devices.

Viewport configuration and sizing

The viewport is the actual viewable area of a browser window, including any chrome from the application itself.

Google prefers content that can be served in a manner that is in sympathy with the constraints of the users’ device. In practice, this means using responsive design rather than an “” custom mobile site.

They also require that you explicitly configure your metadata to instruct the browser to control the dimensions of the page and scaling so that it fits the users’ screen properly.

Use legible font sizes

Pretty straight forward to understand, and a final example of how usability, accessibility and mobile optimisation intersect.

By Rik Williams

I write about how to collaborate to design simple, usable and inclusive information experiences that make the lives of customers easier. Read more in Categories and Tags.