I think it's because "async" has been overloaded. The post isn't about what I thought it would be upon seeing the title.

I was thinking this would be about using multiprocessing to fire off two or more background tasks, then handle the results together once they all completed. If the background tasks had a large enough duration, then yeah, doing them in parallel would overcome the overhead of creating the processes and the overall time would be reduced (it would be "faster"). I thought this post would be a "measure everything!" one, after they realized for their workload they didn't overcome that overhead and async wasn't faster.

Upon what the post was about, my response was more like "...duh".