Does anyone know which ballpark Go is in, performance-wise? In my mind, it's a bit faster than Python, whereas I would expect it to be closer to C. However, I have no clue how I formed this opinion, so actual benchmarks would help.

I wonder how it compares to pypy.

Well, there's lies, damn lies and benchmarks, but the Shootout has Go: http://shootout.alioth.debian.org/u64q/compare.php?lang=go (only the standard compiler, though. No gccgo)

"After all, facts are facts, and although we may quote one to another with a chuckle the words of the Wise Statesman, 'Lies--damned lies--and statistics,' still there are some easy figures the simplest must understand, and the astutest cannot wriggle out of." Leonard Henry Courtney, 1895

That's very useful, thank you. I wish it had PyPy, though...

"If you're interested in something not shown then please take the program source code and the measurement scripts and publish your own measurements."

http://shootout.alioth.debian.org/more.php#languagex