What are Core Web Vitals?

Core Web Vitals are a set of metrics that assess the user experience on web pages. They include:

• Largest Contentful Paint (LCP) for load performance,

• Cumulative Layout Shift (CLS) for visual stability, and

• First Input Delay (FID) for interactivity.

Google uses Core Web Vitals in their ranking systems as page experience signals. Other page experience signals are mobile friendliness, HTTPS (secure connection), and the absence of intrusive interstitials.

What Core Web Vitals are good?

According to Google’s documentation, to provide good user experience, the Core Web Vitals for pages should be:

• LCP: less than 2.5 seconds

• FID: less than 100 milliseconds

• CLS: less than 0.1