What Are Core Web Vitals?
Core Web Vitals are a set of metrics used by Google to measure user experience based on actual user data. Core Web Vitals consist of Largest Contentful Paint (LCP), First Input Delay (FID), and Cumulative Layout Shift (CLS).
First Input Delay (FID): This metric measures the time from when a user first interacts with your site by clicking a link or tapping a button to the time when the browser actually responds to that interaction. FID often happens when the main browser thread is busy doing something so it doesn’t respond to the user.
If a web page doesn’t have a passing score for any of the Core Web Vitals, then steps should be taken to fix it. Google uses Core Web Vitals as part of its ranking algorithm systems.
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