The source – twitter.com
The Google team is working on two new metrics within the Web Vitals project, "Smoothness" and "Responsiveness."
"Adaptability" should better capture the end-to-end latency of individual events and offer a more holistic picture of a page's overall response rate throughout its lifecycle.
"Smoothness," based on lab data, will address animation performance and the overall smoothness of interaction with the page.