> what C# lacks here? Options. You are talking about the very tiny subset of Java users who actively worry about the relative differences in performance tweaka

> what C# lacks here? Options. You are talking about the very tiny subset of Java users who actively worry about the relative differences in performance tweakability of different JVM implementations. Chances are that they routinely run multiple VMs and VM configuration sets in parallel on real world inputs to find the fastest configuration. "Look at this nice VM, trust us, it's very fast, rewrite all your code and see for yourselves!" just won't be very convincing to those. With that crowd, .NET isn't competing against the JVM, it's competing against against an entire market of competing JVMs.