TTFB (Time To First Byte)
TTFB measures request-to-first-byte latency. Good ≤800ms. Driven by CDN edge distance, origin response, TLS handshake, SSR render time — the upstream bottleneck for other Core Web Vitals.
TTFB measures request-to-first-byte latency. Good ≤800ms. Driven by CDN edge distance, origin response, TLS handshake, SSR render time — the upstream bottleneck for other Core Web Vitals.
What is TTFB (Time To First Byte)?
TTFB measures request-to-first-byte latency. Good ≤800ms. Driven by CDN edge distance, origin response, TLS handshake, SSR render time — the upstream bottleneck for other Core Web Vitals.
Details and examples
Wins: edge-cache HTML, HTTP/3, TLS 1.3 0-RTT, slim SSR.
Related terms
Core Web Vitals, Page Speed.
TTFB (Time To First Byte) · term at a glance
| Field | Value |
|---|---|
| Term | TTFB (Time To First Byte) |
| Category | Metrics |
| Related | Core Web Vitals, Page Speed |
Frequently asked questions
What is TTFB (Time To First Byte)?
TTFB measures request-to-first-byte latency. Good ≤800ms. Driven by CDN edge distance, origin response, TLS handshake, SSR render time — the upstream bottleneck for other Core Web Vitals.
References
By the 23SEOGEO team · Last updated: