What is RTT in CDN context?

RTT (Round-Trip Time) is the time it takes to send a request to a CDN server and receive a response. It is measured in milliseconds and indicates the network's response speed.

What is the difference between TTFB and RTT?

TTFB (Time To First Byte) measures the time from sending an HTTP request until receiving the first byte of the response. RTT measures the complete data exchange cycle at the network level. TTFB is usually greater than RTT because it includes the server's request processing time.

What Availability metric is considered good for CDN?

For professional CDN providers, an Availability (uptime) rate of 99.9% or higher is considered standard. Market leaders achieve 99.99% or even 99.999% availability.

Comparison of CDN Provider Download Speeds

Real-world throughput by provider: who is faster in practice?

Все CDNvideo EdgeCenter Curator Megafon MWS CDN

RTT TTFB Throughput Availability

Conduct a test

Dynamics of average download speed

Average download speed
for period

What is Throughput and why measure it?

Throughput — the actual data transfer speed between a CDN node and the user. Measured in Mbps.
This metric is critical for:

video streaming and live broadcasts
websites with large images and files
software and game distribution

What do the Throughput charts show?

Average download speed trend chart (cached/notcached) — two key scenarios. Cached — the speed at which files are served from the CDN cache, reflecting real infrastructure performance. Notcached — the speed when fetching from your origin server. A large gap between the lines shows how important it is to configure caching correctly.
Cities with low speed — regions with congested uplinks or insufficient local node capacity. Critical for audiences in those specific locations.
Providers with low speed — a comparative bandwidth ranking. A provider with capacity headroom does not throttle speeds during peak load hours.