Google has recently announced Core Web Vitals as an essential metric to view how websites load, using these metrics as quality signals as a way to judge user experience.
Google has stated that Core Web Vitals ARE a ranking factor
Each of the Core Web Vitals represents a form of the user experience, is measurable with Google’s tools, and reflects the real-world experience of user.
While there are only 3 metrics just announced as part of Core Web Vitals, this is set to evolve over time with more factors being introduced. The current metrics focus on loading, interactivity and visual stability.
- Largest Contentful Paint (LCP): measures loading performance. To provide a good user experience, LCP should occur within 2.5 seconds of when the page first starts loading.
- First Input Delay (FID): measures interactivity. To provide a good user experience, pages should have a FID of less than 100 milliseconds.
- Cumulative Layout Shift (CLS): measures visual stability. To provide a good user experience, pages should maintain a CLS of less than 0.1.