← Glossary

    Web & UX

    Core Web Vitals

    Short definition

    Core Web Vitals are Google's three speed-and-stability metrics — LCP, INP, and CLS — that measure how quickly and smoothly a page loads and responds.

    In depth

    Largest Contentful Paint (LCP) measures load speed; Interaction to Next Paint (INP) measures responsiveness; Cumulative Layout Shift (CLS) measures visual stability. Google uses Core Web Vitals as a ranking signal, and more importantly users abandon slow or jumpy pages. Targets: LCP under 2.5s, INP under 200ms, CLS under 0.1. Most service-business sites fail one or more of these; fixes include image optimization, font swap, lazy loading, and removing render-blocking JavaScript.

    Example

    A med spa cuts hero-image weight from 2.4 MB to 180 KB and switches to font-display:swap. LCP drops from 4.1s to 1.6s, organic traffic rises 28%.

    Related terms

    Page SpeedUX (User Experience)CRO (Conversion Rate Optimization)

    Related glossary

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    Glossary

    Page Speed

    Page speed is how quickly a webpage becomes useful to a visitor, measured in seconds from initial request to interactive.

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    UX (User Experience)

    UX is the discipline of designing how a person feels and what they can do when they use a product, with the goal of making the desired action effortless.

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    CRO (Conversion Rate Optimization)

    CRO is the practice of getting more visitors to take the action you want — call, fill a form, or buy — without having to spend more on traffic.

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