Core Web Vitals
Also known as: CWV
What is Core Web Vitals?
Core Web Vitals are three field metrics Google uses to quantify page experience. Largest Contentful Paint (LCP) measures loading (aim under 2.5s), Interaction to Next Paint (INP) measures responsiveness to input (aim under 200ms, having replaced First Input Delay in 2024), and Cumulative Layout Shift (CLS) measures visual stability (aim under 0.1).
They are a lightweight ranking signal and, more importantly, a strong driver of user behavior — faster, more stable pages convert better and bounce less. Google measures them from real users (field data) via the Chrome UX Report, not just lab tests.
Common fixes: optimize and lazy-load images, reserve space for media to prevent layout shift, defer non-critical JavaScript, and use server-side rendering so content appears fast.
Why it matters
Slow, janky pages lose both rankings and conversions — CWV puts a number on it.
Core Web Vitals — FAQ
What are good Core Web Vitals scores?
LCP under 2.5 seconds, INP under 200 milliseconds, and CLS under 0.1, measured at the 75th percentile of real-user visits.
Did INP replace FID?
Yes — Interaction to Next Paint replaced First Input Delay as a Core Web Vital in March 2024, giving a fuller picture of responsiveness across all interactions.
Related terms
Rich Results
Rich results are enhanced Google listings — stars, prices, FAQs, images — generated from structured data on your page.
Structured Data (Schema Markup)
Structured data is machine-readable code (usually JSON-LD) that labels page content so search and answer engines understand it precisely.
Crawl Budget
Crawl budget is the number of pages a search engine will crawl on your site in a given period, set by crawl rate and crawl demand.
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