Core Web Vitals & Page Speed Tests
Core Web Vitals are Google’s metrics for loading (LCP), interactivity (INP) and visual stability (CLS). Google’s assessment uses field data from real Chrome users over 28 days.
These tests run one lab page load in Chromium. Lab results are useful for debugging, but they will not match your Search Console or PageSpeed Insights field data. INP needs real user interaction, so the lab tests report Total Blocking Time as a stand-in.
Core Web Vitals Test
Lab LCP and CLS, plus Total Blocking Time as a lab stand-in for INP, from a real Chromium render.
LCP Test
Lab Largest Contentful Paint against the Core Web Vitals thresholds.
CLS Test
Lab Cumulative Layout Shift against the Core Web Vitals thresholds.
Page Request Checker
Counts the network requests needed to load the page.