Re: Java, slow?
You're right, there are 'specialized low-latency JVMs' available, like the Azul systems Zing JVM, which sets you back $3500 USD PER server and PER year.
Compared to the free .NET Framework JVM, which performs already very well, that's extremely much.
.NET can even simply compiled to native code nowadays, which means it nears C++ execution times.