What is TTFB by UTM Medium
TTFB by UTM Medium shows the Time to First Byte (TTFB) value across different UTM mediums (e.g., see_pricing_options). This lens helps you identify which mediums are associated with slower server responses.
The list only includes UTM mediums that drove traffic during the selected timeframe. If a medium wasn’t active in that period, it won’t appear in the list.
TTFB represents how fast your server (or CDN) responds to a user's request. When high, it can hint at server latency, geographic distance, or caching issues.
Healthy TTFB by UTM Medium sample
Should you worry
A healthy TTFB by UTM medium lens shows mostly green. Even if some mediums are slightly slower, the absence of yellow or red usually means there’s nothing critical. The greener the UTM medium, the quicker your users get that initial server response.
Unhealthy TTFB by UTM Medium sample
In the example below, TTFB by UTM medium shows that some mediums (like see_pricing_options or cta) are slow to respond. This can frustrate users right at the entry point, increasing exit and bounce rates.
Resolving unhealthy TTFB by UTM Medium
Go-to action plan to resolve an unhealthy TTFB by UTM Medium:
Ask Uxi to analyze your TTFB by UTM Medium values and suggest improvements.
Use Filters to drill into the slow medium and determine which pages are commonly accessed.
Simulate TTFB of the suspected lens to see if fixing it will resolve the TTFB by UTM Medium. If yes, this is where the resolution focus should be.
Use an automated optimization tool like Navigation AI to improve your TTFB by UTM Medium 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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