How to Monitor Website Response Time
Separate DNS, TLS, TTFB and transfer timing, set useful thresholds and investigate slow responses.
Login2Cloud product team · Published 2026-10-01
Response time needs a definition
An HTML request duration covers network stages and transfer, not the rendering of all page assets. TTFB describes time until the first response byte. Neither metric alone proves that a visitor can complete a checkout.
Use a baseline and an absolute threshold
Suppose retained normal TTFB is 300 ms and current TTFB is 750 ms: the increase is 150%. Compare enough observations and also choose an absolute threshold that matters to the endpoint. One isolated sample should prompt investigation rather than a reliability claim.
Locate the slow stage
A DNS increase suggests resolver or delegation investigation. Slow TCP or TLS can involve network or handshake conditions. Increased TTFB warrants application, database and cache review. Large HTML transfer time may reflect payload size or throughput.
Verify a change safely
Run the response-time tool before and after a controlled change and compare equivalent periods in monitoring. Keep availability and degradation separate. Use browser profiling for rendering and assets that the HTML timing check does not measure.
Common questions
Where should I start?
Use the related tool to inspect the current signal, then configure the matching monitor and verify its first result.