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Wednesday, January 10, 2018

How Google PageSpeed Insight Tool Determines Page Speed Score

Have you used Google PageSpeed Insight tool to test your site page speed before? If you have not, why not try it. If you have, what is your page speed score? Fast, Average or Slow? How does Google PageSpeed Insight Tool even determine the score to give to the page you ran a test on?
If you seek an answer to the last question above, then read on.



Google PageSpeed Insight tool uses the median value of data from two API request to score the page you test. These two API are First Contentful Paint (FCP) and DOM Content Loaded (DCL).

The First Contentful Paint (FCP) API is used to ascertain the point when the user's browser render the first bit of content from the DOM. The first bit of content can be text, image, SVG, or even a <canvas> elements.

The Dom Content Loaded (DCL) API on the other hand is used to get the timestamp, from when the browser is about to start parsing the first received bytes of the webpage till when the DOM is ready.

After these API requested have been made, and their metrics are both at the top-third of their category, then the page is considered fast!

Now you know how Google PageSpeed Insight tool determines the speed score of your webpages.



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