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).
Why Google Page Speed Insights show different score everytime time I analyze the website?
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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.
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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
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: