[vidarh]

> Go is 1-2 orders of magnitude faster than Ruby

That may be true for some types of code, but for an app that's predominantly shuffling data over the network you should be spending most of the time in kernel space executing syscalls, and then language differences are largely irrelevant.

> and much easier to write concurrent code in.

How? Writing concurrent code in Ruby is trivial since 1.9.x (prior to 1.9 you had to battle the green threads in MRI for some stuff), which isn't exactly new.