Google Reassessing Use of Scores in Speed Testing
Google are reassessing their use of scores as part of testing tools, like PageSpeed Insights, as this can result in people focusing too much on addressing things that will improve their score rather than other areas which will have a bigger overall impact.
Testing Tools Can Incorrectly Show Scripts Aren’t Optimised
Testing tools, like PageSpeed Insights, can show that scripts such as Google Analytics or AdSense aren’t optimised because they are configured for specific browsers.
Page Speed Update Will Use Scale to Assess Speed
The Page Speed update will be on a scale where: the faster pages are, the more Google can take this into account. This approach is opposed to Google’s previous speed update, which only differentiated between very slow pages and all other pages.
Load Scripts After Rendering to Improve Page Speed
Consider embedding scripts so that they load after the page has rendered to improve load time, especially if it is only required for functionality.
Google Will Determine Page Speed Based On User Experience
Google’s mobile speed update will use a number of different factors to determine speed, including some metrics from Chrome that provide information about actual user experience. This means that you should optimise your site to be faster for users and not just Googlebot.
Use Pre-rendering for Mobile to Avoid Issues with Google’s Speed Update
Google’s Mobile Speed Update Will Only Apply to Mobile Search Results
The Mobile Speed Update will only apply to mobile search results so desktop results won’t be affected.
Google Looks at Overall Picture When Assessing Site Speed
Google looks at the overall picture when assessing site speed because optimising for individual metrics such as Time to first byte (TTFB) might not acually improve the overall experience for users.