How efficient can cat(1) be?

https://ariadne.space/2022/07/17/how-efficient-can-cat1-be/ · There have been a few initiatives in recent years to implement a new userspace base system for Linux distributions as an alternative to the GNU coreutils and BusyBox. Recently, one of the authors of one of these proposed implementations made the pitch in a few IRC channels that her cat implementation, which was derived from OpenBSD’s implementation, was the most efficient.