Ruby on Rails

If I want to tailor Rails 4 for an API-only application, what should I do to maximize performance?

This is to be fronted by a js framework, and left open for other API usage.

I'm aware of rails-api and other API gems, but in this case specifically need to stay on the main path with Rails 4.

I've spent a lot of time reading up on this, and haven't found much dealing with Rails 4 specifically (that doesn't recommend other gems, which aren't an option here). I remember reading about how to do this with Rails 2 or 3, but am wondering what the current recommendations are for version 4. This would include things like removing unnecessary dependencies.

Thanks!

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