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What Is Google PageSpeed Insights (PSI)? — Wiki
Google PageSpeed Insights is designed to help improve user experience by providing insight into how quickly pages load and what elements of a page may be slowing it down.. Google PageSpeed Insights provides scores on a scale from 0-100 that can be used as indicators of website performance relative to other sites on the internet.
What Is Google Lighthouse? — Wiki
Google Lighthouse provides automated tests that evaluate the performance, accessibility, best practices and progressive web apps related metrics of any given website.. Google Lighthouse offers insights into how a page is performing on different devices and browsers.