Measure time to first byte for any URL — how long your server takes to start responding. Free, instant, no sign-up.
Time to first byte (TTFB) measures how long your server takes to send the first byte of a response. It is a core signal of hosting and origin performance — and a common reason pages feel slow even when assets look optimized.
Under 200ms — a fast origin response from our check node.
Under 500ms — acceptable for many sites, with room to improve.
500ms or more — visitors feel the wait; hosting and caching deserve a look.
Slow TTFB delays everything downstream — paint, interactivity, and Core Web Vitals.
We time the request until response headers arrive from our check node.
A one-shot TTFB measurement you can run any time, with no account required.
この無料ツールについての短い回答です。登録は不要です。
TTFB is how long it takes for a browser to receive the first byte of the response after requesting a URL. It reflects DNS, connection setup, TLS, and server processing before content starts arriving.
無料移行には DNS、SSL、メールレコードが含まれ、切り替え前に確認します。
