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PageSpeed Insights Checker is a tool developed by Google that allows users to analyze the performance of a webpage and to get suggestions on how to improve its speed. It provides a score, called "PageSpeed Score" on a scale of 0 to 100, that indicate how fast the page loads and how well it performs on both mobile and desktop devices. The higher the score the better the performance of the webpage.
The tool uses a set of rules, called "performance best practices", to evaluate the webpage and identify areas for improvement. These best practices include things like minimizing the size of resources, reducing the number of requests made by the webpage, and using browser caching.
The PageSpeed Insights Checker also provides a list of suggestions for improving the performance of the webpage, along with the estimated impact of each suggestion on the page's loading time.
This tool can be useful for web developers and designers to measure the performance of their web pages and to identify areas for improvement. It can also be used by marketers and website owners to optimize the performance of their website to provide better user experience, lower bounce rates and improve search engine rankings.