async await performance?

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Yes, in theory. Not normally, in the real world.

In the common case, async is used for I/O-bound operations, and the overhead of thread management is undetectable in comparison to them. Most of the time, asynchronous operations either take a very long time (compared to thread management) or are already completed (e.g., a cache). Note that async has a “fast path” that kicks in if the operation is already completed, where it does not yield the thread.

For more information, see the Zen of Async and Async Performance.

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