Dashboard
Real-User Metrics

Core Web Vitals Monitor

My Core Web Vitals Alerter queries real-user performance data from Google's Chrome UX Report database and alerts you if your scores slip. It checks the three metrics Google uses as page experience signals: Largest Contentful Paint (loading speed), Interaction to Next Paint (responsiveness), and Cumulative Layout Shift (visual stability). Run a one-off check to see where your pages stand today, or set up a weekly monitor to catch performance regressions before they affect your rankings.

LCP (p75 Mobile) i This monitors the Largest Contentful Paint metric to measure when the main content of the page loads.

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INP (p75 Mobile) i This monitors the Interaction to Next Paint metric to evaluate page responsiveness during user interactions.

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CLS (p75 Mobile) i This monitors the Cumulative Layout Shift score to track visual stability and layout movement during loading.

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Historical Performance (Previous 6 Months)

Historical performance trend will render here after executing an audit scan.
Console idle. Enter details above and click 'Run Test' to simulate metric crawling.
Common Questions

Frequently Asked Questions

It queries the Chrome UX Report (CrUX) database, which collects real performance data from Chrome users who visit your site. The tool returns 75th percentile scores from the most recent 28-day collection window. This is the same data Google uses when assessing page experience.

The three Core Web Vitals: Largest Contentful Paint (LCP), which measures how quickly the main content loads; Interaction to Next Paint (INP), which measures how quickly the page responds to user input; and Cumulative Layout Shift (CLS), which measures how much the layout moves around during load.

Focus on your highest-traffic organic landing pages, main category or collection pages, and any templates used across multiple URLs. These pages tend to be the most complex and are the most susceptible to silent regressions introduced by CMS updates, new tracking scripts, or media changes.

Page experience is a confirmed Google ranking signal. A sudden drop in LCP or INP directly affects user engagement and signals poor page quality to Google's crawlers. Catching a regression early, before it has been recorded across a full collection cycle, gives you time to fix it before it affects your rankings.

Historical Release Log

v1.2.0 2026-07-03
Added a stateless historical performance line graph plotting monthly metric shifts directly from live Chrome UX Report timeseries payloads. Integrated an overall Lighthouse performance score card with slot machine animation counter, dynamic text colour warnings, and an explainer panel for official compliance thresholds.
v1.1.0 2026-06-11
Migrated from First Input Delay (FID) to Interaction to Next Paint (INP) as the primary user responsiveness flag, following Chrome performance standards.
v1.0.0 2026-03-15
Initial launch of real-user data integration querying Google CrUX dataset for Largest Contentful Paint (LCP), Interaction to Next Paint (INP), Cumulative Layout Shift (CLS), and First Input Delay (FID).