Google has recently increased attention to Web Core Vitals (WCV) - a set of website parameters that reflect user interaction with the site, which measures not only server time, but also render time, visual consistency and visual stability of the page. Some sites have seen as much as 50% hit due to issues with Web Core Vitals! The era when you could build huge and slow pages as long as your server responds fast enough, is gone. Now it takes more than that to optimize the site. As you can see, this site running on Drupal, is close to top scores.
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.