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Speed & Core Web Vitals

Google uses Core Web Vitals as a direct ranking factor. We measure your real-user performance using Chrome UX Report field data — not just lab tests — and identify exactly what's slowing you down.

Methodology

What We Check

Largest Contentful Paint (LCP)

How quickly your main content loads. Target: under 2.5 seconds. We break down LCP into its 4 sub-parts to pinpoint exactly where the delay occurs.

Interaction to Next Paint (INP)

How responsive your page is to user interactions. Target: under 200ms. Critical for JavaScript-heavy sites and single-page applications.

Cumulative Layout Shift (CLS)

How much your page layout shifts while loading. Target: under 0.1. Layout shifts frustrate users and signal poor page quality.

Resource Optimization

Unused JavaScript analysis, image format optimization (WebP/AVIF), lazy loading strategy, and preload hint configuration.

Server Performance

Time to First Byte, cache-control headers, CDN configuration, and compression analysis.

Impact

Why It Matters

Since 2021, Core Web Vitals (LCP, INP, CLS) have been confirmed ranking factors. Fail the thresholds and you can slip in the results. But lab tests only tell half the story — what counts is how real people on real phones feel your site. We pull actual Chrome user data to show your true profile.

Real Examples

Issues We Commonly Find

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Hero image set to lazy loading instead of eager, delaying LCP

Adding priority={true} to the Next.js Image component reduced LCP by 800ms

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Cache-Control set to no-cache on all pages including static marketing pages

Every visit triggers a full server render, adding 500ms+ to page loads unnecessarily

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501 KiB of unused JavaScript shipped to mobile users

Increasing Total Blocking Time and degrading INP scores on mid-range devices

Questions

Frequently asked

Which Core Web Vitals do you measure?
Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS) — using both Chrome UX Report field data from real users and Lighthouse lab tests.
Why use real-user data instead of just lab tests?
Lab tests run on one simulated device; real users hit your site on many. CrUX field data shows how your actual visitors experience the page — which is exactly what Google’s ranking signal uses.
Are Core Web Vitals really a ranking factor?
Yes. Since 2021, LCP, INP, and CLS have been confirmed Google ranking signals, and failing the thresholds can demote you in competitive results.
What performance issues do you commonly find?
Lazy-loaded hero images that delay LCP, images without width/height that cause layout shift, unused JavaScript inflating blocking time, and missing cache-control or compression.

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