What is Page Speed Insights? (Product of Google)
Page Speed Insights (PSI) analyzes the content of a web page on both mobile and desktop devices. Once completed, PSI then offers suggestions on how to make your page load faster for these devices.
How to read the scores.
PSI provides a score which displays the page’s overall performance. The score is calculates by running Lighthouse to analyze lab data about the page. A score of 90 or above is good. The next level is 50 to 90, a score that will need improvement, anything below 50 is poor and needs attention right away.