Core Web Vitals are a set of specific factors that Google considers essential in a webpage’s overall user experience. They are part of the larger Web Vitals initiative by Google to provide unified guidance for quality signals that are critical to delivering a great user experience on the web. Core Web Vitals focus on three specific aspects of user experience:
Largest Contentful Paint (LCP):
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- Definition: LCP measures the loading performance of a page. It marks the point in the page load timeline when the main content has likely loaded.
- Good Score: LCP should occur within 2.5 seconds of when the page first starts loading.
First Input Delay (FID):
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- Definition: FID measures interactivity. It is the time from when a user first interacts with a page (like clicking a link or tapping a button) to the time when the browser responds to that interaction.
- Good Score: FID should be less than 100 milliseconds.
Cumulative Layout Shift (CLS):
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- Definition: CLS measures visual stability. It quantifies how much the layout of the page shifts unexpectedly while the page is loading. A high CLS score indicates that the page is unstable, which can be frustrating for users.
- Good Score: Pages should maintain a CLS of less than 0.1.
Why Core Web Vitals Matter:
- Google uses these metrics as part of its ranking factors for search results. Websites that perform well in Core Web Vitals are more likely to rank higher, as they provide a better user experience.
- Improving Core Web Vitals can lead to reduced bounce rates, longer user sessions, and higher conversion rates, contributing to the overall success of a website.
Web developers, SEO professionals, and digital marketers closely monitor and optimize these metrics to ensure their websites meet the standards set by Google for providing a good user experience.