Performance isn't the reason I see people wanting to move away from that stack; it's more about library availability, tool ecosystem (including things like monitoring, so this is an improvement - though I doubt it will stem the tide), and language productivity.

(Not that that your performance sounds like a compelling advantage for that stack. That's what, an average of 700 requests/second/web server? So the peak is probably around 1500? Pretty good indeed, but not outstandingly so - where I worked 3 years ago our system handled peaks of 600 requests/second/web server on a JVM-based stack. And I don't see .net topping the charts on http://www.techempower.com/benchmarks/).