Core Web Vitals in Google Search Console is a dedicated report that measures three user experience metrics Google considers ranking signals: Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS). The report pulls from real user data collected through Chrome browsers, showing which URLs pass or fail Google's thresholds based on actual visitor experiences over the previous 28 days. LCP measures loading speed, specifically when the largest visible element renders. Google wants this under 2.5 seconds. INP replaced First Input Delay in March 2024 and measures responsiveness throughout the page lifecycle, with a target under 200 milliseconds. CLS tracks visual stability, penalizing unexpected layout shifts, with a threshold of 0.1 or less. The GSC report groups URLs by status: Good (passing all metrics), Needs Improvement (borderline), or Poor (failing one or more). It shows both mobile and desktop separately because mobile typically performs worse due to slower connections and less powerful devices. You can click into specific URL groups to see which metric is causing failures and get a representative sample URL to debug. What matters is this is field data from real users, not synthetic lab tests. A page might score perfectly in PageSpeed Insights but fail in GSC if actual visitors on slow networks or older phones struggle with it. The inverse is also true—sometimes GSC shows passing when lab tools show red. At Ottawa SEO, we cross-reference GSC Core Web Vitals with PageSpeed Insights and real device testing because GSC data lags by weeks and requires sufficient traffic volume. Low-traffic pages won't appear in the report at all. When we see failures, the usual culprits are oversized images, render-blocking JavaScript, aggressive ad scripts, or carousels that shift content before users interact. Fixing CWV issues typically improves rankings for competitive queries, though the impact varies by niche—we've seen 5-15% traffic lifts on content-heavy sites after remediation.