Slowest Carrier

For each visit, the DNS and secure-connection stages are summed, then visits are grouped by carrier; the carrier with the highest P95 network time lands on this card. Because the calculation sums the two stages at the per-visit level first, rather than adding two separate percentiles, the result stays closer to what real users actually experienced.

This card is a vital tool for separating responsibility and managing team expectations. When a report of site slowness lands on your desk, this metric helps you immediately tell whether the root cause sits in your own infrastructure and code, or in the network path and the internet carriers involved. If a specific carrier turns out to be systematically slower than the others, the psychological and technical burden of troubleshooting lifts off the development team, since that disruption sits outside your code's direct control. Still, this data's real value shows up when you read it alongside complementary tools like Infrastructure Pulse: if a carrier's speed drop coincides with network alert signals, you end up with solid, reliable documentation for following up technically with CDN providers and carriers to improve the quality of service reaching your end users.