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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: The Emacs master is much slower than the emacs-27 branch.
Date: Sat, 05 Dec 2020 15:41:57 +0200
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Cc: rudalics@gmx.at, stephen.berman@gmx.net, emacs-devel@gnu.org, acm@muc.de
To: Gregory Heytings <ghe@sdf.org>
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 (message from Gregory Heytings on Sat, 05 Dec 2020 12:55:19 +0000)
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> Date: Sat, 05 Dec 2020 12:55:19 +0000
> From: Gregory Heytings <ghe@sdf.org>
> cc: Eli Zaretskii <eliz@gnu.org>, acm@muc.de, stephen.berman@gmx.net,
>         emacs-devel@gnu.org
> 
> The emacs-27 branch since commit 365dad197bac5deec9244fd9c189d23c46c99b31 
> (Sep 4 2019) is about three times slower (at least on this benchmark, with 
> GCC 10.2, on a 64-bit GNU/Linux) than the master branch since commit 
> b9b32074cecb0e0d20cf527eadacbb0b7f5cced9 (Apr 7 2020) with -Og and -O0. 
> With -O[1-3] it is not.
> 
> I'd guess that Eli will merge b9b32074cecb0e0d20cf527eadacbb0b7f5cced9 
> into emacs-27 very soon after the Emacs 27.2 release

No, this is unlikely to happen.  The emacs-27 branch should only get
safe bugfixes at this time.