bug#64735: 29.0.92; find invocations are ~15x slower because of ignores

[Eli Zaretskii]

> From: Ihor Radchenko <yantar92@posteo.net>
> Cc: sbaugh@catern.com, sbaugh@janestreet.com, dmitry@gutov.dev,
>  michael.albinus@gmx.de, rms@gnu.org, 64735@debbugs.gnu.org
> Date: Sun, 23 Jul 2023 11:43:22 +0000
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> But what is the strategy that should be used to call the CALLBACK?
> >> You clearly had something other than "call as soon as we got another
> >> file name" in mind.
> >
> > It could be "call as soon as we got 100 file names", for example.  The
> > number can even be a separate parameter passed to the API.
> 
> Will consing the filename strings also be delayed until the callback is 
> invoked?

No.  I don't think it's possible (or desirable).  We could keep them
in some malloc'ed buffer, of course, but what's the point?  This would
only be justified if somehow creation of Lisp strings proved to be a
terrible bottleneck, which would leave me mightily surprised.