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Core Web Vitals
What are Core Web Vitals?
Core Web Vitals are Google's three metrics for how a page actually feels to use. Largest Contentful Paint (LCP) measures how long the main content takes to appear. Interaction to Next Paint (INP) measures how quickly the page responds when someone taps or clicks. Cumulative Layout Shift (CLS) measures how much the layout jumps around while loading. Together they put a number on loading speed, responsiveness, and visual stability.
The thresholds are specific. LCP should land under 2.5 seconds, INP under 200 milliseconds, and CLS under 0.1, measured at the 75th percentile of real users rather than on a single fast machine. INP replaced First Input Delay in 2024 because FID only captured the first interaction and missed sluggishness that built up afterward. A page that loads its hero image fast but shoves the text down when an ad slot finally renders is exactly the kind of bad CLS users feel and Google counts.
These scores feed Google ranking, so they sit where performance and SEO overlap. Lab tools like Lighthouse simulate a load and predict the numbers, while field data from the Chrome User Experience Report shows what real visitors experience. The two often disagree, and the field data is the one that decides your rank.
Core Web Vitals at Dallonses
We measure before we touch anything. A performance audit on real user data tells us whether a slow LCP is an oversized hero image, a render-blocking script, or a server taking too long to respond, and we fix the cause rather than chase the lab score. Guessing wastes a sprint, so we don't.
The checks then live in the pipeline. We run Core Web Vitals testing on each build, set budgets so a regression fails loudly, and keep tuning loading, interactivity, and layout stability as the product grows. Strong vitals are good engineering and good SEO at once, which is why we treat them as part of the work and not a one-off cleanup before launch.
Page feeling slow or losing rank? Let's measure it and fix what actually matters.
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