What is TTFB?

TTFB is an abbreviation for Time To First Byte. This measures the length of time a browser waits before receiving the first data byte from a server.

More About TTFB

Time To First Byte is one of the metrics that is examined in a Core Web Vitals report, which is used to evaluate the loading experience of a website.

TTFB determines the responsiveness of a server. Since response time is one of the most important aspects of user experience, a poor TTFB score can cause visitors to leave a website. The lower the TTFB, the less time users will spend waiting for a page to load. This can in turn contribute to higher engagement and retention. TTFB can be measured in the lab using WebPageTest. To evaluate TTFB in the field, you can use the Chrome User Experience Report.

Improving a TTFB score can involve upgrading hosting or using a Content Delivery Network (CDN).

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