I don't understand a lot this approach. Basically the front-end is almost always not the problem, but the Db / backend is. And this should be written in C proba

I don't understand a lot this approach. Basically the front-end is almost always not the problem, but the Db / backend is. And this should be written in C probably. If you write a queue system in Ruby and it's slow where is the news? The article title is misleading since Ruby continues to be used for its core business that is the front end.