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Core Web Vitals is the set of website user experience metrics — and soon-to-be ranking factor — released by Google last year. Largest Contentful Paint (LCP), First Input Delay (FID), and Cumulative Layout Shift (CLS) are three aspects of page experience. CLS focuses on the amount of content “movement” that occurs on a web page as it loads. The CLS score will soon be included as a ranking factor in Google’s algorithm.