Question 1

What are the Core Web Vitals for web.dev?

Accepted Answer

web.dev p75 metrics from Google CrUX field data: LCP 2709ms (needs-improvement), INP 129ms (good), CLS 0.080 (good). Data window: 2026-07-23 to 2026-08-19. "Good/needs-improvement/poor" classifications are Google's own thresholds, not editorial verdicts.

Question 2

Where does Web Vitals data for web.dev come from?

Accepted Answer

Google Chrome User Experience Report (CrUX) — real Chrome user field data, monthly updates. CrUX requires sufficient user volume to anonymize; very low-traffic origins won't appear. This page reports p75 values (Google's official metric) across the last 28-day collection window. Source: Google CrUX BigQuery dataset, refreshed monthly.

Question 3

How does web.dev compare to good Core Web Vitals?

Accepted Answer

Google's "good" thresholds: LCP < 2500ms · INP < 200ms · CLS < 0.1. web.dev: LCP ✗ 2709ms (target <2500), INP ✓ 129ms, CLS ✓ 0.080. See /guide for fix-pattern playbooks.

Question 4

Mobile vs desktop Web Vitals for web.dev?

Accepted Answer

Visit /web.dev/mobile for mobile-only CrUX field data and /web.dev/desktop for desktop-only. Mobile typically shows worse LCP + INP than desktop due to slower hardware + network. CLS varies less by device. CrUX splits the same time window across form factors when the origin has enough traffic in each.

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