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Why does Google Page Speed Insights show different score each time I analyze the website? Why it shows different scores whenever I enter the my domain url as with(www.mydomain.com) and without (.mydomain.com). Also with(www.mydomain.com/index.html) and without index.html(www.mydomain.com).

manjunath sutar
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3 Answers3

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I'm sure the scores aren't too off. Google uses a "synthetic" computer and mobile device when running your scores in the attempt to generate a real-world scenario. If you want to run it on your own browser, you can:

  1. Right click on your website
  2. Select "Inspect"
  3. A browser options area will display. Within the top navigation of this area, click "Lighthouse".
  4. You can then run a report on Speed, SEO..etc for both mobile and desktop.
mrwp.io
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  • They are usually VERY off. I ran my website and got a score of 82. Then I REMOVED some fonts, as my only change. Deployed it and the score want down to 64, from removing stuff! Then I ran it again and the score was now 84. This all happened within minutes. Site "hosted" through github pages if it matters. – eligolf Nov 16 '22 at 11:42
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This happens because PageSpeed is based on two factors:

A) Data collected from Chrome users during the last 28 days. B) Real-time data, this metric is influenced by your hosting and the user's connection, for example, which affects the metrics permanently.

PageSpeed is a tool to improve the usability and accessibility of your website, but it is not precise. You should use it as a guide and not as a rule.

Jhonny Alvarez
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PageSpeed Insights docs states the following

Why do the field data and lab data sometimes contradict each other?

The field data is a historical report about how a particular URL has performed, and represents anonymized performance data from users in the real-world on a variety of devices and network conditions. The lab data is based on a simulated load of a page on a single device and fixed set of network conditions.

In there you can also find what device and network Lighthouse uses to simulate page load

Ariel García
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