What is TTFB by click behavior
TTFB by click behavior shows how Time to First Byte (TTFB) differs between sessions with clicks versus sessions without any user interaction.
While TTFB is server-side, this lens helps expose whether slow initial loads are limiting engagement before users ever get a chance to click.
Healthy TTFB by click behavior sample
Should you worry
A healthy state shows:
TTFB is fast for both clicked and non-clicked sessions
Clicked sessions may even show slightly better TTFB — suggesting those visitors are reaching faster or better-cached views
There’s no major server-side penalty that prevents users from sticking around long enough to interact
This means your backend is doing its part to enable engagement: it’s not slowing down the first impression.
Unhealthy TTFB by click behavior sample
If non-clicked sessions have significantly slower TTFB, that likely means:
First visits (or cold-start requests) suffer from slow server responses
Poor caching or CDN strategy fails users on their first load
Bots or real users bounce before they ever see a usable page
If clicked sessions have worse TTFB (less common), it may reflect:
Deeper pages or actions routed through server-side logic
Personalization or dynamic content slowing down responses mid-session
Resolving unhealthy TTFB by click behavior
Go-to action plan to resolve an unhealthy TTFB by click behavior:
Ask Uxi to analyze your TTFB by click behavior values and suggest improvements.
Use Filters to isolate slow TTFB on non-clicked/clicked sessions, then correlate with landing page lenses or status codes.
Simulate TTFB of the suspected lens to see if fixing it will resolve the TTFB by click behavior. If yes, this is where the resolution focus should be.
Use an automated optimization tool like Navigation AI to improve your TTFB by click behavior values.
Once you’ve improved TTFB, set an alert to be the first to know if it starts worsening again.
Try it yourself
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