Technical SEO

TTFB (Time to First Byte)

Quick Definition

TTFB measures how long the browser waits for the first byte of data from the server. Good TTFB is under 200ms.

In context

TTFB is a server-side metric heavily influenced by hosting quality, database performance, and CDN configuration. Slow TTFB is the foundation of slow LCP — fixing it requires hosting upgrades, caching, or moving to edge rendering.

Have a question this didn't answer?

Book a free 60-minute strategy call. We'll explain how this concept applies to your specific situation.

Book a Free Call Browse 50+ Detailed Answers

Related terms

Dofollow

Dofollow describes any link without a nofollow attribute — the default behaviour, which passes ranking authority from the linking page to the linked page.

Lazy Loading

Lazy loading defers loading of images and iframes until they're about to enter the viewport, reducing initial page weight.

Sitemap Index File

A sitemap index is a special XML file that references multiple individual sitemap files — required when a single sitemap exceeds 50,000 URLs or 50 MB and useful for organising sitemaps by content type.

307 Temporary Redirect

A 307 status code is a temporary HTTP redirect that, unlike 302, is guaranteed to preserve the original request method (POST stays POST, not converted to GET).

Noindex

Noindex is a meta tag (<meta name='robots' content='noindex'>) that tells search engines not to include the page in their index, even though it can be crawled.

HTTP/3 (QUIC)

HTTP/3 is the third major version of HTTP, built on QUIC (UDP-based) instead of TCP, eliminating head-of-line blocking and reducing connection-setup latency.

Back to all terms