RTT (Round Trip Time) — the time it takes for a data packet to travel from the user to the CDN node and back. Measured in milliseconds. The lower the RTT, the faster the browser establishes a connection with the server. High RTT is especially critical for:
Average RTT chart — lets you track network stability. Sharp spikes indicate backbone channel congestion or issues at specific provider nodes.
Cities with high RTT — regions where the provider's CDN node is physically far from users or connectivity with local operators is not optimally configured.
Providers with high RTT — a comparative latency ranking. Helps quickly determine whose infrastructure is closer to your audience.