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developer.mozilla.org

Core Web Vitals from Chrome user field data

MobileDesktop
LCPgood
1074ms
Largest Contentful Paint
INPgood
49ms
Interaction to Next Paint
CLSgood
0
Cumulative Layout Shift
FCPgood
971ms
First Contentful Paint
TTFBgood
426ms
Time to First Byte

Historical trend

LCP history, most recent on the right. Green line = 2500ms (good), red = 4000ms (poor).

How developer.mozilla.org compares

About these measurements

These numbers come from Google's Chrome UX Report (CrUX) — real user field data collected from Chrome browsers worldwide. They are p75 values, meaning 75% of developer.mozilla.org's users experienced this score or better. Learn more about Core Web Vitals or CrUX vs Lighthouse.

Recommended reading for developer.mozilla.org

Get this data as JSON: /api/developer.mozilla.org