What are Core Web Vitals?
Core Web Vitals are a set of specific factors that Google considers important in a webpage's overall user experience. They are made up of three specific page speed and user interaction measurements: LCP, FID, and CLS.
LCP: Largest Contentful Paint
This measures how long it takes for the largest piece of content on your page (usually an image or heading) to appear. For a good user experience, LCP should occur within 2.5 seconds.
FID: First Input Delay
FID measures the time from when a user first interacts with your site to the time when the browser is actually able to respond to that interaction. Ideally, this should be less than 100 milliseconds.
CLS: Cumulative Layout Shift
Have you ever tried to click a button only for the page to move at the last second? That's layout shift. CLS measures the total score of all unexpected layout shifts that occur during the entire lifespan of the page.