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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 Time On Webpage? — Wiki
Maximize the Time On Page focusing the efforts towards optimizing both usability and engagement with visitors by providing relevant information in an easily digestible format that encourages . Time on webpages is one of the most important factors to consider when optimizing a website for search engine rankings.