With async, things happening far away can completely prevent you from making progress, in which case you are better off doing something else in the meantime, li

With async, things happening far away can completely prevent you from making progress, in which case you are better off doing something else in the meantime, like simply blocking and scheduling a thread from a different process as even the cost of swapping threads, destroying the caches and other cpu state is minimal and nothing else can be done. The optimization begins instead of a single thing prevents you from making progress, it's a set of things, so you can parallelize the tasks and handle them in the seemingly random order they happen to finish. Now the question is how is this not an event loop running async tasks?