> Date: Fri, 07 Jul 2017 12:47:35 +0300

> From: Eli Zaretskii <eliz@gnu.org>
> Cc: emacs-devel@gnu.org
>

> I timed the current implementation at 0.2 msec, in an optimized build;

Trying to repeat this for several large buffers, I get much faster
performance: 0.04 micro-seconds per call.  I guess something was wrong
with my original timing.

In any case, it's _fast_.