Great article! We tend to hear a lot about Ruby’s and Rails performances issues and I think this is not that true. As any other languages and framework, if the peoples who code do not pay attention to performances, their app will not have great performances. Some of the biggest company still use Ruby, such as the one you mention (I can add Stripe and Doctolib to that list) and don’t seems to struggle that much about performances, more than with another language. Matz annouced that Ruby 3.0 will focus on performances so the language can catch up with the lack of performances on some built in method and having a language as slick as perfomant so it’ll be definitly less relevant to talk about Ruby and RoR as a “not performing language”.

I think we do need to mention that Ruby also benefit from a tight-knit and welcoming community that allow the language to evolving fast and prosper easily.