[marcosdumay]

The stream reader userspace libraries are very well optimized for handling that kind of "dumb" usage that should obviously create problems. (That's one of the reasons Linux expects you to use glibc instead of making a syscall directly.)

But I imagine the time reading ones aren't as much optimized. People normally do not call them all the time.

[saagarjha]

They look very similar on macOS.