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Page Speed Checker is a Free SEO Tool that webmasters use to measure how fast the content on a page loads.
What is Page Speed?
Page speed is often confused with "PageSpeed Insights Checker".
Page Speed Checker gives you a real number for how long your page takes to load. While PageSpeed Insights Checker, gives you a score from 0-100 based on how well your site is technically optimized, with separate scores for desktop and mobile.
More information about PageSpeed Insights Checker can be found at Google Developers Page.