Core Web Vitals
Definition
Core Web Vitals are a set of metrics Google uses to measure real-world page experience: Largest Contentful Paint (LCP) measures loading speed, Interaction to Next Paint (INP) measures responsiveness to user interaction, and Cumulative Layout Shift (CLS) measures visual stability while a page loads.
Google evaluates these metrics using real-user field data at both the page and site level, and treats strong scores as a tiebreaker ranking signal, meaning they matter most when competing pages are otherwise similar in content quality and relevance.
Beyond direct ranking impact, weak Core Web Vitals scores tend to correlate with a poor overall user experience, slow, janky pages that AI crawlers may also fetch and process less efficiently, indirectly affecting how quickly and reliably content can be indexed and retrieved.
BotRank's technical audits check Core Web Vitals alongside crawler access and structured data, since a technically healthy site supports both classic SEO and AI search visibility.
Frequently Asked Questions
What are the three Core Web Vitals metrics?
Largest Contentful Paint (loading speed), Interaction to Next Paint (responsiveness), and Cumulative Layout Shift (visual stability), each with defined good, needs-improvement and poor thresholds.
What replaced First Input Delay (FID)?
Interaction to Next Paint (INP) replaced FID in March 2024 as Google's responsiveness metric, since it measures the full interaction rather than just its initial delay.
How much do Core Web Vitals affect rankings?
They act as a tiebreaker signal, meaning they carry more weight when competing pages are similar in content quality, rather than overriding strong content with poor technical performance.
How can a site improve its Core Web Vitals?
Common fixes include compressing and modernizing images, deferring render-blocking scripts, reducing server response time, and reserving space for dynamic elements to prevent layout shifts.
