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 is an open-source tool built by Google to help developers measures the performance and standard of their web pages. . Google Lighthouse is a free, open-source auditing tool for improving the quality of web pages.
What Is On-Page SEO? — Wiki