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.
