Core Web Vitals and Page Speed: How Do They Affect Rankings?
Core Web Vitals are the three core metrics Google uses to measure user experience: loading speed (LCP), interaction responsiveness (INP) and visual stability (CLS). Weak values lower both rankings and conversions, because users don't wait on a slow page.
The three metrics
- •LCP (Largest Contentful Paint): time to load the main content — under 2.5s is good.
- •INP (Interaction to Next Paint): responsiveness to clicks — under 200 ms is good.
- •CLS (Cumulative Layout Shift): how much the page shifts — under 0.1 is good.
How to improve
- •Optimize images (modern format, correct size, lazy loading).
- •Reduce unnecessary JavaScript and defer non-critical scripts.
- •Prevent shifts by reserving space for fonts and layout.
- •Use fast hosting and caching.
Look at field data
Lab tests (e.g. Lighthouse) give direction, but field data (CrUX / Search Console) shows the real user experience.
Especially on bot-protected sites, synthetic tests can mislead; make decisions with real user data.
Frequently Asked Questions
Does speed alone get you to the top?
No. Speed is an important factor but works together with content quality, relevance and authority. Poor speed, however, can hold back even good content.
Does mobile or desktop matter more?
Google evaluates mobile-first. So you need to keep Core Web Vitals good on mobile first.
Related Posts
Content SEO and E-E-A-T: The Content Google Trusts
What are Experience, Expertise, Authoritativeness and Trust (E-E-A-T)? How do you produce the original content that search engines and AI value?
SEOOn-Page SEO Guide: Title, Meta and Heading Structure
Title, meta description, heading hierarchy and internal linking: the basics of optimizing a page for both users and search engines.
Want your site visible in search and AI answers?
Write to us for a free preliminary analysis — we will map your current state and propose a concrete roadmap.
Request Free Analysis