> for webservers because they're mostly I/O bound

I'm not a web person, but can't you also gain I/O from parallelization? The I/O bound is waiting on responses right? So parallelization should increase I/O because you can make multiple asynchronous requests and even if there is dependence you can often stage or do partial computation in the mean time (at least this is common in scientific computing). (And if disk, well reading/writing to disk in parallel is far faster than serial but idk why you'd read/write to disk with pure python. Though it seems people do). So wouldn't this have significant effects that are more than the 36ms that we see in TFA? Or am I missing something and can someone explain why my guess is wrong?