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

[Eli Zaretskii]

> From: Michael Albinus <michael.albinus@gmx.de>
> Cc: yantar92@posteo.net,  dmitry@gutov.dev,  64735@debbugs.gnu.org,
>   sbaugh@janestreet.com
> Date: Fri, 21 Jul 2023 13:32:46 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> Users can call the command, if they know for sure they don't use remote
> >> files ever. Authors could use the macro in case they know for sure they
> >> are working over local files only.
> >>
> >> WDYT?
> >
> > How is this different from binding file-name-handler-alist to nil?
> > Tramp is nowadays the main consumer of this feature, and AFAIU your
> > suggestion above boils down to disabling Tramp.  If so, what is left?
> 
> jka-compr-handler, epa-file-handler and file-name-non-special are
> left. All of them have their reason.

I know, but when I wrote that disabling file-handlers is
inconceivable, I meant remote files, not those other users of this
facility.

Let me rephrase: running Emacs commands with disabled support for
remote files is inconceivable.

IMO, if tests against file-name-handler-alist are a significant
performance problem, we should look for ways of solving it without
disabling remote files.

In general, disabling general-purpose Emacs features because they
cause slow-down should be the last resort, after we tried and failed
to use smarter solutions.