Core Web Vitals

GarbuzSEO Specialist Published October 1, 2026

Definition

Core Web Vitals — Core Web Vitals are three Google metrics for real user experience: LCP (loading), INP (responsiveness) and CLS (visual stability).

“Good” thresholds at the 75th percentile: LCP ≤ 2.5 s, INP ≤ 200 ms, CLS ≤ 0.1. Field data (CrUX) matters, not just Lighthouse.

LCP — how quickly the largest visible element renders;
INP — how quickly the page responds to interactions (it replaced FID in March 2024);
CLS — how much elements shift during loading.

Lighthouse measures a single simulated load. Search Console and CrUX show real users’ experience over 28 days — that is the data Google uses.

LCP measures the time until the largest text block or image in the viewport is rendered.

INP measures the latency of interactions (clicks, taps, key presses) throughout the visit and reports one of the slowest.

CLS measures visual stability: how much page elements shift unexpectedly.

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