[kc5tja]

That's a positive for Ruby only when you're not running on a cloud server, or when you are cost-conscious about the amount of electricity you're sucking in a data center somewhere.

That being said, that Ruby is 10x slower than Go isn't that much of a surprise. It's not a string-interpreted language like the BASICs of old. It's interpreting byte-codes, and anyone who's ever written a 6502 or Z-80 emulator (essentially the same thing) can tell you, on average, most byte-codes take 10x as long to run as the corresponding function written in in-line C.

Computer science -- it works!