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PageSpeed Insights calculates the performance of a webpage for mobile and desktop devices. It fetches the website url two times. once with a mobile user-agent, and once with a desktop user-agent.
Pagespeed Checker checks your webpage and provide a score from 0 to 100 points which falls three categories:
These factors are also used by Google for ranking your website. The faster your website loads, the lower the bounce rate. If your website is fast, you have a better chance of ranking on Google by beating slow sites that drive high bounce rates.
Use our Page Size Checker tool to measures the size of your webpage which will give you an idea before optimizing it in a better way.