I second that resources consumption with Rails on the production system is only a problem in specific settings (e.g. when your business model depends on many cheap transactions, or when you are running on diverse sets of hosts outside of your control… I'm looking at you, GitLab).
Nonetheless, as a junior Rails developer coming into a 5 people team on a mid-sized project, I saw a diverse set of performance problems during the development phase. E.g. asset pipelines that take ages to compile so that rapid development cycles become impossible or a test suite that took heroic efforts to get down to 15 minutes despite not really doing much computationally-wise. I'm open to alternative interpretations, but I've got the impression that in more performance oriented frameworks the best practice would not turn out to be setting up and tearing down half your server stack before and after each controller test, but instead we would have chosen abstractions that can be plugged together more efficiently.
Nonetheless, as a junior Rails developer coming into a 5 people team on a mid-sized project, I saw a diverse set of performance problems during the development phase. E.g. asset pipelines that take ages to compile so that rapid development cycles become impossible or a test suite that took heroic efforts to get down to 15 minutes despite not really doing much computationally-wise. I'm open to alternative interpretations, but I've got the impression that in more performance oriented frameworks the best practice would not turn out to be setting up and tearing down half your server stack before and after each controller test, but instead we would have chosen abstractions that can be plugged together more efficiently.