Time to First Byte Checker
Measure how long a server takes to send the first byte of the response after a request starts.
Powered by Geekflare Loadtime API
What Is Time to First Byte (TTFB)?
Time to First Byte (TTFB) measures how long it takes for a browser to receive the first byte of a server response. It is one of the earliest performance signals in a page load because the browser cannot start rendering HTML until the server begins sending data.
A fast Time to First Byte (TTFB) usually means the server is responding quickly enough for the browser to begin loading the page without a long wait. A slow TTFB can come from backend processing delays, uncached pages, heavy database queries, redirect chains, DNS delays, TLS negotiation, or a distant origin server.
If the result is 800 ms or higher, start by checking whether the page can be cached, whether redirects are necessary, and whether the origin server or CDN is adding avoidable latency.
What the Tool Shows
| Field | Meaning |
|---|---|
| Time to First Byte | The measured TTFB in milliseconds. |
| Result | FAST when the value is below 800 ms, otherwise SLOW. |
5 Ways to Improve Time to First Byte (TTFB)
- Reduce expensive backend work before the response starts.
- Put static assets and cacheable pages behind a CDN.
- Host your applications in same region as users.
- Use caching to cache page content.
- Avoid multiple redirects.
Frequently Asked Questions
Time to First Byte (TTFB) measures how long it takes for the first byte of the server response to arrive after a request starts. It includes network, DNS, TLS, redirect, and server processing time.
A Time to First Byte (TTFB) below 800 ms is generally considered healthy for most public pages.