What is Core Web Vitals?

Core Web Vitals are a set of metrics Google introduced to measure how a page actually feels to use, as opposed to how it performs in a synthetic lab test disconnected from real visitors. The current core metrics are Largest Contentful Paint (LCP), how long it takes the main content of a page to become visible; Interaction to Next Paint (INP), how responsive the page feels when a user actually clicks or taps something; and Cumulative Layout Shift (CLS), how much visible content jumps around unexpectedly while the page loads. Each has a threshold Google considers "good," and pages that clear all three tend to perform better in search, all else being equal.

These metrics matter for straightforward reasons a business owner will recognize without any SEO background: a slow, janky page loses visitors before they ever see what it has to offer, and Google has explicitly said page experience is a ranking factor, though a comparatively modest one next to content relevance and authority. What's less obvious is the AI-search angle: a page that's slow or unstable to render is also harder for automated systems, including AI crawlers, to fetch and process reliably within their own time and resource budgets. A technically broken page is a liability for humans and machines alike.

Core Web Vitals are also, practically speaking, one of the more mechanically fixable categories of technical debt: unoptimized images, render-blocking scripts, and missing size attributes on media (which causes layout shift) account for a large share of poor scores, and each has a well-understood, standard fix. That makes this one of the higher-leverage places to start technical cleanup, since improvements are usually fast to implement and easy to verify with a before-and-after measurement.

Ritam Labs' audit checks Core Web Vitals via Google PageSpeed Insights as part of the Technical Health dimension (D1), the audit's foundational dimension that every other score is built on top of. Because broken technical fundamentals cap everything else, Technical Health findings, Core Web Vitals included, are typically the first fixes a report surfaces.