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What is PageSpeedInsight? I think most front-end developers have heard of Google's official PageSpeed Tools, which has an online version and a Chrome extension called PageSpeed Insights. So this test tool, from Google, analyzes the content of web pages to provide Suggestions on how to optimize the loading speed of web sites. PageSpeed Insights is a Google browser plug-in that can analyze the opening speed of web pages. Through the analysis of PageSpeed Insights plug-in and give corresponding optimization Suggestions, website developers can find out the bottleneck of website speed and optimize the corresponding website to bring better user experience.