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That's rather handwavy.

The question is about a performance benchmark. From a performance standpoint, rpc and rest are the same (http requests that execute code on the server).

The "semantics" you assign to one or the other don't change the technical details about implementation and performance.

But in this case there is almost no difference. Basically same payloads with a slightly different "command" format.

It's the same payloads with a slightly different command format if you structure your program in exactly the same way. The point is that you don't structure your program in exactly the same way in each case.

Semantics is 90% of life!