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Google Page Speed is basically a code optimizer for your website. As for purpose, Page Speed does exactly what its' name implies, it makes your website faster. Page Speed runs numerous diagnostic tests and checks your website for best code. Page speed has a built-in set of standard rules that are considered to be the optimum settings for a website. During a Page Speed scan, factors such as web server configuration, Javascript, CSS, upload time, and download time are all tested against these optimum settings. After the scan has completed, Page Speed will rate your website with a general score for each factor. Page Speed will give you some suggestions on how to improve the code of your website, as well as allow you to improve some things automatically, such as fixing Javascript code and compressing images.