This is kind of a snake pit. Google now has three different but related page performance initiatives. 1. Pagespeed insights 2. Web vitals, further sub divided

This is kind of a snake pit. Google now has three different but related page performance initiatives. 1. Pagespeed insights 2. Web vitals, further sub divided into Core Web Vitals and just Web Vitals. 3. Lighthouse They all work together or are sub components of the other. Even more, two of three Core Web Vitals (Cumulative Layout Shift and First Input Delay) are not really reliably measures in a typical lab environment like PSI and Lighthouse: they require actual user interaction with a page. They are essentially RUM (Real User Monitoring) metrics. Other Web Vitals like Time to First Byte are much more deterministic.