What does the Core Web Vitals check measure?
It reads the three Core Web Vitals from real-user (field) data and reports whether each meets Google's "good" threshold:
- LCP — Largest Contentful Paint (loading): time until the main content renders. Good is ≤ 2.5 seconds.
- INP — Interaction to Next Paint (responsiveness): how quickly the page reacts to taps and clicks. Good is ≤ 200 milliseconds.
- CLS — Cumulative Layout Shift (visual stability): how much the layout jumps as it loads. Good is ≤ 0.1.
All three in the "good" range passes; one or more in "needs improvement" is a warning; any metric in the "poor" range is a fail. Field data reflects what real visitors experienced, not a single lab run.
How is it evaluated, and how is it scored?
GEObubbly reads your page's Core Web Vitals from real-user field data (the kind Google aggregates in the Chrome User Experience Report) and compares each metric against the "good" thresholds. It's a core, scored Performance check that runs server-side, since field data is collected from real visits over time rather than a single page load.
Why Core Web Vitals matter for SEO and GEO
Core Web Vitals are part of Google's page experience signals, so they directly influence ranking — especially as a tie-breaker between pages of similar relevance. But the bigger reason to care is user behaviour: a page that loads slowly (poor LCP), feels sluggish when tapped (poor INP), or jumps around as it loads (poor CLS) drives people away before they read anything. The field-data distinction matters: a page can look fast in a lab test on a fast connection yet score poorly for real users on mobile networks, so optimising for real-world conditions is what counts. Common wins are compressing and right-sizing the largest image (LCP), reducing heavy JavaScript that blocks the main thread (INP), and reserving space for images and ads so content doesn't shift (CLS). For GEO, speed matters indirectly — fast, stable pages get crawled more efficiently and provide a better landing experience for the traffic AI citations send — but the core payoff here is rankings and user retention.