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Let's suppose the webserver takes 0ms to run. How much would that help ?

To serve a single client, it doesn't matter, but when you're serving more than a few thousand of clients concurrently, there's benefits to a faster web-server. I mean, more concurrent clients on the same hardware, better average/worst-case latency, need for less hardware, less chance of a bottleneck...

That still doesn't make much sense. The gains of sticking with a proven, solid server which you are familiar with surely outweigh the 0.5% speed increase.

To be honest, I'm not really aching for a 0.5% speedup (at best).

http://en.wikipedia.org/wiki/Amdahl%27s_law