technical

TTFB

Time to first byte — server response speed.

Definition

Time to First Byte (TTFB) is how long the browser waits before receiving the first byte from the server. Good: <800ms. Affects LCP directly.

Related terms

Core Web Vitals

Google's user experience metrics.

LCP

Largest contentful paint — page load metric.

CLS

Cumulative layout shift — visual stability metric.

INP

Interaction to next paint — responsiveness metric.

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