TTFB checker
Measures DNS, connect, TLS and time-to-first-byte across a few samples from the A2Z.tools server - not Core Web Vitals field data.
1 · Input
What is checked
A hand-timed connection to the target - DNS lookup, TCP connect, TLS handshake (for HTTPS), and time to the first byte of the response - repeated across a few samples and reported as median, minimum and maximum rather than one possibly-noisy number.
Server-observed, not field data
These timings are measured from wherever the A2Z.tools server itself is hosted, at the moment of the check - they are not Core Web Vitals field data collected from real visitors, and TTFB is never presented here as LCP, INP or CLS. Real-world TTFB varies by a visitor's own geography, your cache state, and current load in ways a single-location server-side check cannot capture.
Rate this tool
Was this tool useful? Your feedback helps us improve it.