Progressive Web Apps have quite some advantages. The biggest one being a web-product with a native-like feeling. But it is also fast and mobile first, or rather should be. This is the untold story about PWA, impacting your conversion.
First Meaningful Paint is one of the six performance metrics tracked and displayed by Lighthouse. It measures when the primary content of a page is visible, but is more of a guess. It became time for a new metric.
The biggest challenge under the former PageSpeed Insights test has been completely annulled as the PageSpeed Insights uses the Lighthouse engine nowadays.