Core Web Vitals measure specific parts of your site as stand-ins for larger design concerns. But what are they and what are good scores?
Google’s goal is to deliver the websites that searchers want to see. While this includes assessing content, it’s also about user experience. Their Core Web Vitals are an attempt to measure three important aspects of UX: loading, interactivity, and visual stability.
1. Loading: LCP
LCP is short for Largest Contentful Paint, and it measures how long it takes for the site to load the biggest thing, usually an image, on the page. Anything over 2.5 seconds needs improvement in Google’s eyes, a slight difference from the old 3 second rule in website design.
Core Web Vitals are an attempt to measure three important aspects of UX: loading, interactivity, and visual stability
2. Interactivity: FID
FID means First Input Delay, and it tracks the time between a website’s loading time and when it becomes clickable. Ideally, you want this to be less than 100 ms, with anything from there up to 300 ms as needing improvement.
3. Visual Stability: CLS
CLS stands for Cumulative Layout Shift. Ever been to a website, tried to interact with it only for an element to load, throwing off the layout and causing you to click on something you never wanted? This is what CLS watches, and the less the better. A good user experience requires a CLS of 0.1 or less, with a CLS of up to 0.25 needing improvement.
Google’s Core Web Vitals are vital for SEO, but perhaps more importantly, they’re vital for a good UX. If a visitor encounters a site that takes forever to load, can’t be clicked on, and shifts around wildly making navigation difficult, they’re unlikely to come back. Keep your Core Web Vitals in mind for a site that will excel on SERPs and for your customers.