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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: [RFC]: replace-region-contents
Date: Wed, 06 Feb 2019 18:00:22 +0200
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To: Tassilo Horn <tsdh@gnu.org>
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> From: Tassilo Horn <tsdh@gnu.org>
> Cc: monnier@IRO.UMontreal.CA,  emacs-devel@gnu.org
> Date: Tue, 05 Feb 2019 18:19:13 +0100
> 
> > In what version of Emacs?  I think it was slow in 26.1, but wa ssped
> > up significantly since then.
> 
> Master as of today.
> 
> > If you are using emacs-26 or the master branch from Git, and it is
> > still slow, can you show an example where it's slow, and tell how much
> > time it took?
> 
> I prepared a tar.xz with a synthetic, huge, one-line JSON file generated
> by https://next.json-generator.com and a lisp file benchmarking the
> current against my proposed version of `json-pretty-print'.
> 
> https://drive.google.com/open?id=1kKahq3csBVXWL-nN1-eMhgDctGWBN1AR

Ouch!

I guess we'd need to limit use of replace-region-contents to small
enough JSON strings?