Core Web Vitals Checker
Core Web Vitals are Google's key user-experience metrics for modern websites. They measure how fast your site becomes usable, how stable it feels while loading, and how responsive it is when someone tries to interact.
This page gives you a quick way to understand what "passing" looks like and how to interpret your numbers. If you already have values from PageSpeed Insights, paste them in to get a simple pass/fail and a clear set of next actions.
Enter Your Core Web Vitals
Passing Core Web Vitals usually isn't one quick fix—it's about your page structure, media, scripts, and tracking stack working together. Structure1 Digital rebuilds performance-first sites that hit modern benchmarks and convert on mobile.
Get My Free Performance SnapshotWhat These Metrics Mean
Largest Contentful Paint (LCP)
LCP measures when the largest visible element on your page becomes visible to the user. It's the best single metric for understanding how fast your page feels. Good LCP is 2.5 seconds or less. If LCP is slow, it usually means images aren't optimized, the server is responding slowly, or above-the-fold content is blocked by heavy JavaScript or CSS.
Interaction to Next Paint (INP)
INP measures how long it takes your page to respond when someone clicks, taps, or types. Good INP is 200 milliseconds or less. Bad INP usually means your JavaScript is heavy or poorly optimized, third-party scripts are blocking interactions, or your code is running long tasks. Improving INP usually means reducing JavaScript and optimizing event handlers.
Cumulative Layout Shift (CLS)
CLS measures how much your page layout shifts while loading. Good CLS is 0.1 or less. If CLS is high, visitors click on the wrong thing because elements moved, or ads push content down without warning. Fix this by reserving space for images, ads, and dynamic content, and avoiding layout-shifting fonts.