Technical SEO
Core Web Vitals
Core Web Vitals are Google's set of user experience metrics: LCP (Largest Contentful Paint), INP (Interaction to Next Paint), and CLS (Cumulative Layout Shift).
Key Takeaway
Core Web Vitals are Google's set of user experience metrics: LCP (Largest Contentful Paint), INP (Interaction to Next Paint), and CLS (Cumulative Layout Shift).
Why core web vitals matters for SaaS
Core Web Vitals are ranking factors. Poor scores can hurt rankings, especially on mobile. But they're also proxies for user experience—fast, stable pages convert better.
How tracerHQ measures core web vitals
tracerHQ pulls Core Web Vitals data from GSC. You see which landing pages have poor UX metrics that might be hurting conversions—not just rankings.
Core Web Vitals in depth
Core Web Vitals are three field-measured UX metrics Google uses as a ranking signal: Largest Contentful Paint (LCP) measures loading performance and should be under 2.5s; Interaction to Next Paint (INP, which replaced FID in 2024) measures interactivity and should be under 200ms; Cumulative Layout Shift (CLS) measures visual stability and should be under 0.1. Scores come from real-user data collected via the Chrome User Experience (CrUX) report, not lab tools, so a page can pass in Lighthouse but fail in the field. Pages are classified at the URL-pattern level (similar pages are grouped), and the Vitals ranking signal is a tiebreaker among similarly relevant results rather than a dominant factor.
Examples in practice
A team sees LCP of 3.8s on their pricing page due to a hero image not using next/image with priority. Adding priority loading drops LCP to 1.9s and moves the page into the "Good" bucket.
A SaaS has a CLS of 0.35 because a cookie banner and a late-loading newsletter form push content down. Reserving space with CSS min-height drops CLS to 0.04.
An agency rolls out INP optimizations (breaking up long JS tasks, debouncing handlers) and watches their client's INP drop from 320ms to 150ms, correlated with a 6% CTR lift on mobile.
Common mistakes
- Relying only on Lighthouse (lab) scores, which do not match real-user CrUX data.
- Fixing the homepage in isolation while ignoring the template that affects thousands of pages.
- Treating Core Web Vitals as the primary SEO lever when content and links matter more for most sites.
- Ignoring INP because a page feels fast; INP measures the slowest interactions, not the average.
Track core web vitals in your dashboard
Connect Google Search Console and start seeing your metrics by keyword.