[jrochkind1]

> they would still have significant issues even if they switched to cedar and unicorn with 2-4 worker processes.

Yeah, but how about config.threadsafe! with puma or thin in multi-thread mode?

It is odd to me that very little of this conversation on the nets recognizes that Rails _does_ support multi-threaded concurrent request handler, with the right app server stack (figuring out the right app server stack can be non-trivial, although it's getting better).