I posted this on Reddit the other day and was surprised by how few people knew about this so I'll post it here to see if it's helpful:

This is a report in the Google Search Console for doesitarm.com. It gives you the percentage of pages that are "Good Page Experience" meaning they load fast and don't do frustrating things like have slow buttons or jump content while you're reading it.

This also means that when Google starts using Good Page Experience as a ranking factor in search these pages will rank higher than equally relevant websites that don't have "Good Page Experience".

This is a super big deal for internet companies that depend on search for business so naturally, Google has made this a very high standard that's hypothetically harder to game and is providing tools and resources for developers to make the existing sites better in a way that's actually helpful to humans using websites.

It's similar to when Google started ranking HTTPS higher but with a metric that is not so simple to win at.