Core Web Vitals
Core Web Vitals are Google's three UX performance metrics: LCP (Largest Contentful Paint ≤2.5s), INP (Interaction to Next Paint — Good ≤200ms / Needs Improvement 200-500ms / Poor >500ms), CLS (Cumulative Layout Shift ≤0.1). All three must be green to qualify as 'Good' and affect mobile ranking.
Category: Technical
What is Core Web Vitals?
Core Web Vitals are Google's three UX performance metrics: LCP (Largest Contentful Paint ≤2.5s), INP (Interaction to Next Paint — Good ≤200ms / Needs Improvement 200-500ms / Poor >500ms), CLS (Cumulative Layout Shift ≤0.1). All three must be green to qualify as 'Good' and affect mobile ranking.
How do you apply it in practice?
Checklist:
• LCP: preload hero image, CDN, font-display swap.
• INP: split long tasks, use React 18 useTransition.
• CLS: set image width/height, font size-adjust.
Why does it matter for AI search citations?
Generative search engines tend to extract sentences that are clearly defined, consistent and quotable on their own. Writing concepts like "Core Web Vitals" as one consistent definition across your site, backed by structured data and verifiable sources, lowers the chance of being misread. This improves readiness only; it does not guarantee citations or ranking gains — measure actual citations to know.
Which related terms should you know?
SEO (Search Engine Optimization)
SEO (Search Engine Optimization) uses three pillars — technical, content, and links — to earn higher organic rankings on Google and Bing. By 2026 SEO has merged with GEO: the same article must satisfy both crawlers and AI citation engines.
Page Speed
Page Speed measures the time from request to interactive, quantified by the three Core Web Vitals (LCP / INP / CLS). Mobile thresholds are stricter — on 3G, LCP should be ≤4s; each extra second adds ~7% to bounce rate.
Core Web Vitals at a glance
| Term | Core Web Vitals |
|---|---|
| Category | Technical |
| Last reviewed | 2026-10-06 |
References
- Google Search Central: SEO documentation
- Schema.org structured data vocabulary
- W3C JSON-LD 1.1 Recommendation
- GEO: Generative Engine Optimization (arXiv paper)
These documents support the definitions and methods, not ranking or citation promises; reviewed as of 2026-10-06.
By the 23SEOGEO team · Last updated: