These things take a long time. Heck, it might even be a bit early to call LLVM mature. Sure, it supports a C and C++ compiler, but I don't think it has anything production-ready for much else.
It's in extensive use by Apple on the iPhone and in XCode, and outside Apple. The JVM is also well understood and widely deployed.
By comparison the Parrot project with the widest use is Rakudo, which is still just at a testing stage. Maybe there's some larger user of Parrot that I haven't heard about, so correct me if I'm wrong.
Lua 5.2 has been feature complete on Parrot for years. Like LLVM and the JVM, we'll keep tuning and improving and fixing bugs and adding features to make language implementation easier, but the correlation between "maturity" and "use" is strong.
The URL to the benchmark script was broken so I couldn't run it.
Don't get me wrong, I think Parrot's very neat. But I could see why compiler implementors would be sceptical of it since it's not feature complete, and seemingly not very optimized. So there's a lot of unknowns.
