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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: Fri, 04 Dec 2020 15:28:06 +0200
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To: Stephen Berman <stephen.berman@gmx.net>
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In-Reply-To: <874kl1spe9.fsf@gmx.net> (message from Stephen Berman on Fri, 04
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> From: Stephen Berman <stephen.berman@gmx.net>
> Cc: acm@muc.de,  emacs-devel@gnu.org
> Date: Fri, 04 Dec 2020 13:54:06 +0100
> 
> >> As noted above, I build both master and emacs-27 with CFLAGS='-Og -g3'.
> >> Given that, is such a difference still expected?
> >
> > No.  But if you see this consistently, please produce and post the
> > profile of each of the versions, and let's take it from there.
> 
> Since the builds I ran the benchmark on were about two weeks old, I
> updated both branches now, rebuilt and ran the benchmark again, and got
> the same results: ~21 seconds on master, ~61 seconds on emacs-27.
> Profiles attached.

Thanks.  It looks like everything is just two to 3 times slower in
Emacs 28 on your system, which is definitely not my experience.

Are you sure all the Lisp files are byte-compiled?  What happens if
you "make bootstrap" in both branches, and then try again?