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Re:Rails 5.0: Action Cable, API mode, and more by anonyfox on Friday July 01, 2016 @02:27PM (#12018523)
I'd say you really should have a look into https://www.youtube.com/watch?v=OxhTQdcieQE . A really great presentation, including numbers and real world backup data, plus conceptual overviews.
Re:Rails 5.0: Action Cable, API mode, and more by davidw on Friday July 01, 2016 @03:25PM (#12019001)
It's pretty good, but a bit hype-y.

Functional programming is not an 'antidote' to having to go back and read old code or necessarily understanding it easily.

It references this:

http://sorentwo.com/2016/02/02/caching-what-is-it-good-for.h...

Which is interesting, but I don't see source code. 1.5-2X is pretty believable, but quite a bit less than "12 times" - which someone quoted here.

Re:Rails 5.0: Action Cable, API mode, and more by anonyfox on Friday July 01, 2016 @04:06PM (#12019268)
I can personally confirm above 10x improvements over rails, but can't Share the code :)

Depends on what you're doing though. Seems to excel when having low CPU intensive workloads but high traffic pressure from my experience.