Core Web Vitals are the 3 key metrics that Google believes indicate healthy performance for your web site.
Whether you agree with their selection of metrics or not, soon you will not really have a choice.
Unlike their previous PageSpeed metrics, which did not impact ranking at all, Core Web Vitals will eventually be used as a ranking signal.
Today, we’re building on this work and providing an early look at an upcoming Search ranking change that incorporates these page experience metrics. We will introduce a new signal that combines Core Web Vitals with our existing signals for page experience to provide a holistic picture of the quality of a user’s experience on a web page.https://webmasters.googleblog.com/2020/05/evaluating-page-experience.html