I might be wrong but aren't real-time areas like WebSockets not really strong points in Rails? I do see that Action Cable appears to have improved, and I don't know at what point performance issues would get in the way, and I also probably don't know about some potential solutions. Should one choose Rails for an application with significant real-time / reactive functionality?

For me the most important one is performance and the lack of trust in my code (run time errors).

- https://blog.codinghorror.com/performance-is-a-feature/

- http://www.nicolas-hahn.com/python/go/rust/programming/2019/...

I totally agree that app performance is important.

But I really think there is a difference between framework/programming language performance and acceptance-level app performance.

It is possible to have a good performance app (Github, Shopify ) even if you don't believe that Ruby is good enough in this category.