Two new Web Vitals metrics have been spotted in development

The source –  

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. 


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