Core Web Vitals is a relatively new concept introduced by Google in it's search algorithm, which adds a new evaluation criteria to the search ranking. The new Core Web Vitals criteria measure how your web site performs, both load time speeds and the rendering speeds. Drupal has always been a very robust and performant system. There is no surprise that it performs so well with Core Web Vitals, making the rest of the popular CMS chase after it. Read the whole article for more details.