Core Web Vitals

Largest Contentful Paint (LCP) measures when the main content renders; good is 2.5 seconds or less. Interaction to Next Paint (INP), which replaced First Input Delay in 2024, measures responsiveness to user input; good is 200 milliseconds or less. Cumulative Layout Shift (CLS) measures unexpected layout movement; good is 0.1 or less. Google evaluates these at the 75th percentile of real-user data, so a page must perform for most visitors, not just on a fast test machine.

Field data (from the Chrome UX Report) is what counts for rankings; lab tools like Lighthouse are diagnostic. A page can score well in the lab and fail in the field on slower devices and networks.

AI engines do not publish Core Web Vitals as a ranking factor, but the connection is real and indirect. Engines that retrieve from search indexes inherit Google's quality preferences, where vitals contribute. AI crawlers operate with limited budgets, and pages that respond slowly or depend on heavy JavaScript rendering get crawled less completely, reducing the content available for citation.

The user side matters too: AI referral visitors arrive with high intent, and a slow first load wastes the most valuable traffic you have. Conversion impact from performance is best measured on your own funnel, where high-intent AI sessions make degradation expensive.

Monitor field data through the Chrome UX Report, Search Console's Core Web Vitals report, or a first-party real-user-monitoring tracker that records LCP, INP and CLS per pageview. Common fixes: compress and properly size the LCP image, eliminate render-blocking scripts, reserve space for embeds and ads to prevent shifts, and break up long JavaScript tasks for INP. Treat vitals as part of broader page readiness for AI: fast, stable, server-rendered pages are easier for both users and crawlers. Geonimo's analytics tracker captures Core Web Vitals from real visitors per pageview, so performance can be reviewed alongside AI traffic in page optimization work.