Time toFirst Byte

How long the browser waits between requesting a page and receiving the first byte of the response.

Growth Score · Activation

Definition

What it means

TTFB includes network time and the server's work to build the page. Values under about 800 milliseconds are considered good. Caching, a CDN and efficient back-end code reduce it.

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Guides that cover it

Checkout audit: 12 leaksTwelve places a sale leaks, in cost order, with a test and a fix for each one.When to redesign your siteHow to tell a real redesign need from vanity, and how to do it without losing rankings.Fast for real visitorsRead real visits, then fix images, scripts, layout shifts and the slow start.

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FAQ

Quick answers

What is Time to First Byte?

How long the browser waits between requesting a page and receiving the first byte of the response.

Where does it sit in Growth Score?

It belongs to the Activation pillar, one of the 12 pillars your score is built from.

What should I read next?

Start with Largest Contentful Paint and CDN, then browse the other terms in Activation.

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Nearby in the A to Z

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Growth Score reads your site and scores its Activation pillar against sites like yours.

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