Serving 6.8 million requests per second at 9 Gbps from a single Azure VM
At Illyriad Games we are building a new scale of gaming for Age of Ascent, an Ultra-MMO with real-time twitch combat at unprecedented scale. We also want an instant-on and always-updated experience rather than waiting for gigabyte downloads and patches; so we are eschewing conventional wisdom for high speed game clients and building it in javascript and webgl rather than C/C++ and DirectX/OpenGL. But that is a tale for another time…
For our high throughput needs, prevailing wisdom would suggest you need to write your server in C++, use UDP rather than TCP and run on a very high spec bare metal box running linux. We are already running the client in javascript; so if we ran over TCP (websockets), wrote the server code in managed C#, ran on Windows on a VM in the cloud – is this just madness?

лек // http://www.ageofascent.com/azure-cloud-high-speed-networking/