Which CDN does Gumlet use?

I am worried about latency and delay in video streaming at the end-user side, what kind of caching mechanism is followed by Gumlet to prevent it?

Gumlet uses the Fastly CDN which is the most premium CDN, with the highest cache hit rates and the shortest latencies and we also have Cloudfront as a backup CDN.
For more information: https://www.fastly.com/