What is TTFB by checkpoint
TTFB by checkpoint lens breaks down Time to First Byte (TTFB) by user journey checkpoints — the key moments like landing, product, cart, and checkout that define how users move toward conversion.
TTFB measures how long your server takes to start responding. If TTFB is high at a specific checkpoint, users may wait too long to see any part of the page — leading to early drop-offs or frustration at crucial stages.
Healthy TTFB by checkpoint sample
Should you worry
In a healthy view, TTFB remains in the green across all major checkpoints. That means your server is responding quickly no matter where the user is in the journey.
Even if response times vary slightly, the key is to avoid yellow or red, especially at high-traffic or high-intent checkpoints.
Unhealthy TTFB by checkpoint sample
When you see poor TTFB on key checkpoints — like Checkout or Product — it usually points to:
Server-side personalization or authentication slowing down responses.
Uncached pages or API calls for logged-in users.
Backend logic delays for dynamic content or A/B test variations.
This adds friction during critical steps and increases the chance of exits.
Resolving unhealthy TTFB by checkpoint
Go-to action plan to resolve an unhealthy TTFB by checkpoint:
Ask Uxi to analyze your TTFB by checkpoint values and suggest improvements.
Use Filters to pinpoint high-latency pages or user groups.
Simulate TTFB of the suspected lens to see if fixing it will resolve the TTFB by checkpoint. If yes, this is where the resolution focus should be.
Use an automated optimization tool like Navigation AI to improve your TTFB by checkpoint 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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