I think it's pretty easy to build a GraphQL endpoint. We built one pretty quickly for a project and it went pretty smoothly. I think your mileage might vary on performance in this regard but I wouldn't think Rails itself is the bottleneck. If you put GraphQL in front of, say Postgres, you might be creating some query inefficiencies in the form of some leaky abstractions. This could be dealt with through some caching but you wouldn't get it for free. I would think if GraphQL was layered on top of a different type of DB, it would be more efficient. But I don't know the nitty gritty of this.

Ruby's bad for concurrency and generally running lots of code, but in this case, the query is going to be the bottleneck and I think that would be language/framework agnostic.

Thanks for your answers! I think I'll give RoR a try for my next project.

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