The author says that he doesn't particularly care about speed if development is nicer, but it's good to know anyways:
http://shootout.alioth.debian.org/u32q/benchmark.php?test=al...
http://shootout.alioth.debian.org/u32q/benchmark.php?test=al...
http://shootout.alioth.debian.org/u64/benchmark.php?test=all...
These are the x64 quad-core measurements -
http://shootout.alioth.debian.org/u64q/compare.php?lang=go
> given that this days most systems are x64
Given x86 and x64 and single-core and quad-core are all out there - the benchmarks game shows measurements for each of them.