[wizzwizz4]

The OS is very rarely the bottleneck.

[amelius]

Until it becomes the bottleneck.

[imoverclocked]

This person is running node.js. I seriously doubt the OS is the bottleneck.

[forkfork]

The bottleneck is gunzipping & deserializing a huge JSON object using a very slow language (Node.js).

This was attempting to simulate the type of load I see in the wild, rather than serving "Hello world" using C++.