I have used and deploy Go/Elixir/Clojure to some certain success. One thing I feel is that no code is as beautiful as Ruby code to my own eye.
What make Rails bad in your opinion? Is its performance? I think Rails is just a framework with many utility/helper to help you out.
Every framework has its downsides. Personally I think rails is nice (I am very productive with it).
Yes, I come into lots of issue with Spring autoloader to the point I have a zsh alias call `kill_rails` to make sure it kills all the rails and spring instances :(.
That's being said, Spring is an external tool to help solve the slowness of booting up Rails app. I have work in Java/Python and they are slow to bootup too just depend on how big the project is.
Tool like: https://github.com/Shopify/bootsnap help to speed up this as well.
Other option to look at: https://github.com/danielpclark/faster_path
These solves the issue of scanning path, address slowness in a different way compare to preload mechanism of Spring.