What is TTFB by connection type
TTFB by connection type shows the Time to First Byte (TTFB) experienced by users across different effective connection types. This lens helps you identify if server response times degrade under slower or unstable network conditions.
Again, this reflects effective connection types, inferred by the browser based on actual performance — not whether the user is on mobile or Wi-Fi.
Reported type | What it actually means |
5G | Very fast and low latency — often strong Wi-Fi, Ethernet, or 5G |
4G | Good performance — typical for stable Wi-Fi or solid mobile data |
3G | Moderate speed — may include higher latency or slower downloads |
2G | Poor speed — expect noticeable delays, especially for heavy content |
Slow 2G | Very constrained connection — suitable only for lightweight pages or fallback content |
Healthy TTFB by connection type sample
Should you worry
In a healthy chart, TTFB stays low for 5G and 4G. Some increases for 3G and 2G are normal — but nothing should be deep in the red unless something is broken.
Unhealthy TTFB by connection type sample
If 5G and 4G users are seeing high TTFB, that’s not about the network — it likely points to:
Server latency or cold starts
No edge caching on CDN
Third-party scripts slowing the response chain
DNS resolution or TLS overheads
Resolving unhealthy TTFB by connection type
Go-to action plan to resolve an unhealthy TTFB by connection type:
Ask Uxi to analyze your TTFB by connection type values and suggest improvements.
Use Filters to inspect TTFB by country, by URL, or by device memory to triangulate the source.
Simulate TTFB of the suspected lens to see if fixing it will resolve the TTFB by connection type. If yes, this is where the resolution focus should be.
Use an automated optimization tool like Navigation AI to improve your TTFB by connection type 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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