[fernandezpablo]

There's simply no technology that makes you switch from 30 machines to 1 (you say you keep 2 just for reliance).

Obviously there must be other architectural changes in play here (I'm guessing RoRs thread-per-request vs some kind of event loop on Go?). Please be more specific.

[genwin]

Go is good at keeping all the cores on the machine pumping. Maybe they switched to machines with more cores.