RankingsFactor
Official Google Standards

Core Web Vitals Checker

Inspect official Google Core Web Vitals thresholds (LCP, INP, CLS) and measure local browser performance using standard web APIs.

Inspect Website Core Web Vitals Thresholds

Enter any domain to evaluate against official Google 2024 Core Web Vitals criteria and unlock full CrUX monitoring.

Enter a domain (e.g. example.com) or full URL (e.g. https://example.com/page)
Quick test:

Official Google Core Web Vitals Thresholds

To pass the Google Page Experience ranking signal, 75% of page visits must meet the "Good" threshold.

MetricFocus AreaGood (Pass)Needs ImprovementPoor (Fails)
LCP (Largest Contentful Paint)Perceived Load Speed≤ 2.5s2.5s – 4.0s> 4.0s
INP (Interaction to Next Paint)Interaction Responsiveness≤ 200ms200ms – 500ms> 500ms
CLS (Cumulative Layout Shift)Visual Stability≤ 0.100.10 – 0.25> 0.25
FCP (First Contentful Paint)Render Initiation≤ 1.8s1.8s – 3.0s> 3.0s
TTFB (Time to First Byte)Server Latency≤ 800ms800ms – 1800ms> 1800ms

Measured Locally in This Browser

Live measurements collected in your current browser tab via Navigation Timing and PerformanceObserver.

Important Distinction: These metrics represent Local Lab Measurements inside this specific browser environment. They do not constitute Google CrUX field data for third-party sites.

Live INP Responsiveness Test

Click the button below to simulate an interactive user action and record actual main-thread input delay in this browser tab.

Actionable Recommendations

Optimize LCP Candidate AssetsHIGH

Preload your primary hero image with <link rel='preload' as='image'> and ensure responsive srcset tags are specified.

Minimize Interaction to Next Paint (INP)HIGH

Break up long JavaScript tasks (>50ms) using requestIdleCallback() or yield to main thread with setTimeout() / scheduler.yield().

Prevent Layout Shift (CLS)MEDIUM

Always include explicit width and height attributes on <img> and <video> tags to reserve layout space before assets load.

Reduce Time to First Byte (TTFB)MEDIUM

Use edge caching, an enterprise CDN, and optimize server-side database queries to respond within 800ms.

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Full Search Intelligence Platform

Monitor real-user Core Web Vitals across your entire website

Local tests measure a single browser session. RankingsFactor integrates with Google Search Console and CrUX to audit Core Web Vitals for real visitors across mobile and desktop devices site-wide.

Deep multi-page crawl • AEO answer engine tracking • Google Search Console sync

Frequently Asked Questions

Technical specifications, limitations, and SEO recommendations.

The three official Core Web Vitals are Largest Contentful Paint (LCP, measures loading performance, goal ≤ 2.5s), Interaction to Next Paint (INP, measures responsiveness, goal ≤ 200ms), and Cumulative Layout Shift (CLS, measures visual stability, goal ≤ 0.1).