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>If your program is slow because it's waiting for external service response, you're doing programming wrong. Your program should do other work in the meantime.

What work? Mine bitcoins while you wait the result for an API call?

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Usually processing other requests

I think any sane person here assumes any IO, especially in .NET is already async and allows other requests to use that time… Most web apps are still IO constrained.

Sure, but how is waiting for external requests relevant in any way to .NET performance then?

If you're asking "how is waiting for external requests relevant to my service's response time" the answer is "because it's usually the largest part". I really don't know how to explain it more simply than that.

If you need to improve this, and that code is .NET, then the solution is a different design, also in .NET Code.

I am asking how is waiting for external services relevant to .NET processing time.

I refer you to my answer above. https://news.ycombinator.com/item?id=29306220

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