That benchmark is fair if you consider the context: I/O bound workoads. On those kinds of workoads, your app spends a large amount of time waiting for I/O. Whil

That benchmark is fair if you consider the context: I/O bound workoads. On those kinds of workoads, your app spends a large amount of time waiting for I/O. While waiting, it does not use any CPU. This is very well simulated using sleep calls.