And this is what it all boils down to, folks - The argument from ignorance. I've never seen it be false, thus it is true. You cannot demonstrate or have not demonstrated it to be false, thus it is true.
I'd mention that Java has been the just about the most popular language in the world for the past 8 - to 10 years, but then I'd be cmomitting a logical fallacy myself, the appeal to popularity, so I won't. But wait! I kind of just did!
In nany event, it is Java's benchmarks that speak for themselves. Java is fast. Anyone who claims otherwise is simply ignorant.