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This PageSpeed tool is designed to let you check any given webpage and see how well it’s optimized for speed. To provide you with actionable and useful insights, this tool is running on the official Google PageSpeed API. Run the page speed test and use the suggestions and feedback to make your site even faster.
The Google PageSpeed score is kind off unique because of the way Google calculates this score. Most tools look at the total load time of a webpage and because of of the fluctuations and number of external factors involved this will only give you a time specific snapshot. When measuring site speed with essential tools like WebPagetest and Pingdom you’ll see a different load time almost every time you perform a test.
On one hand this is caused by fluctuations like for example time specific traffic load and on the other hand external factors like user connection speed, browser type and physical location influence these numbers.
The Google PageSpeed tool has removed almost all dynamic variables from the equation and instead focusses on the technical static components of your website. With Server response time being the exception here.
An overview of the Google page speed rules: