Skip to content
Flowdira studio
contact@flowdira.com Start a project

Web glossary

What are Core Web Vitals?

Core Web Vitals are a set of Google metrics that measure real-world user experience — loading speed (LCP), interactivity (INP) and visual stability (CLS) — and they factor into search rankings.

Google uses three Core Web Vitals to quantify how a page feels to a real visitor. LCP (Largest Contentful Paint) measures how quickly the main content loads. INP (Interaction to Next Paint) measures how responsive the page is when you click or type. CLS (Cumulative Layout Shift) measures how much things jump around as the page loads.

They matter for two reasons: they're a Google ranking signal, and they directly affect conversion — slow, janky pages lose visitors. 'Good' is roughly LCP under 2.5s, INP under 200ms, and CLS under 0.1, measured on real users.

Every site we build is engineered for strong Core Web Vitals from the start — lean code, optimised images and fonts, and minimal JavaScript — which is why our builds routinely score 90+ in Lighthouse.

Common questions

Do Core Web Vitals really affect SEO?
Yes — they're a confirmed Google ranking signal as part of page experience. They rarely outweigh great content, but between similar pages they can be the tiebreaker, and they strongly affect conversion regardless of rankings.
What are good Core Web Vitals scores?
As a rule of thumb: LCP under 2.5 seconds, INP under 200 milliseconds, and CLS under 0.1, measured on real-world visits. Tools like PageSpeed Insights and Search Console report your scores.

More from the glossary

What is Jamstack? Web term What is Structured data? Web term What is Static site generation? Web term Headless vs traditional CMS Which to choose Website design by industry Built for your sector

Want this built into your product?

We design and integrate fast websites and real AI features — from RAG assistants to lightning-fast front-ends.

Start a project See our work