TTFB includes the work before the first response byte, such as redirects, network connections and the request itself. It is not a measure of the complete page loading and is not a Core Web Vital. web.dev presents it as a useful starting point for investigating response delays. Source: web.dev: Time to First Byte

Compare like with like

Record the page, testing location and connection conditions when comparing results. Check more than one run before deciding a change helped. Keeping those conditions visible gives the website team a clearer starting point than a single number without any context.

Look at the rest of the page too

Review TTFB alongside measures of visible content and interaction, then investigate the stage causing the delay. Avoid treating a quick first response as proof that the whole booking page feels fast. The aim is a usable journey, so test the steps a visitor actually takes.

Written and updated by Travelgenix. Sources checked on 19 October 2026. Practical advice and examples are Travelgenix editorial guidance.