Core Web Vitals are a simple set of measurements on factors that are important to deliver a great user experience. Currently the Core Web Vitals focus on 3 aspects of user experience – loading time, interactivity and visual stability using the following metrics
- LCP (Largest Contentful Paint)
LCP measures loading performance and should occurs within 2.5 seconds on when the page first starts loading - FID (First Input Delay)
FID measures interactivity. To provide a good user experience pages should have a FID of less than 100milliseconds - CLS (Cumulative Layout Shift)
CLS measures visual stability and a good page experience is provided with pages maintaining a CLS of less than 0.1
The best measurement is the Google Search Consoles new Core Web Vitals report which is using real data from your website. However, at this time, many sites are still seeing the “Not enough data for this device type.” notice, which means to gather the data, they need to use a Core Web Vitals Tool to measure these metrics.
Tools such as Page Speed Insights, Chrome UX report, Chrome DevTools and Lighthouse all provide this data along with a long list of other information that many site owners find overwhelming and not sure where to starts
This is where the Simple Core Web Vitals Tool above comes in – using the Lighthouse API it will just return the three Web Core Vital Metrics (LCP, FID and CLS) along with an overall performance grade. This give a quick, easy-to-understand review of how google is currently measuring your website user experience. And if shows if you need to take action now before these metrics are included in how google ranks your site