[d4nt]

A common cause of slowness in .net web app is multiple database round trips during a single request, all happening in sequence. You can write async database calls in .net but they're not the standard / path of least resistance, and by the time you app is hitting these issues, refactoring it all is a big undertaking.

The results do not surprise me, but what I find more interesting is how different ecosystems and frameworks can encourage your average developer to write scalable or non-scaleable apps. And I still think node's model has a lot going for in this regard.

[CodeCube]

With C# 5's async features ... a lot of code can now easily be non-blocking by default. Even making asynchronous actions in asp.net mvc can have an enormously positive impact on server scalability. Just because you can write synchronous/blocking code doesn't limit the power of the platform when it's written using the latest features.