Re: The Emacs master is much slower than the emacs-27 branch.

[Eli Zaretskii]

> Date: Sat, 05 Dec 2020 11:14:25 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: acm@muc.de, stephen.berman@gmx.net, emacs-devel@gnu.org
> 
> I wasn't going to ask that, but I would like to point out one more
> potential difference: I didn't compare two builds of master before and
> after that commit.  Instead, I timed 32-bit builds of the current
> emacs-27 and master branches which were both built with the following
> optional switches to configure:
> 
>   --with-wide-int --with-modules --enable-checking=yes,glyphs 'CFLAGS=-O0 
> -gdwarf-4 -g3'
> 
> Again, I don't expect any of this to matter so dramatically, so this
> is just for completeness' sake.

And one more nit, again for completeness' sake: in both cases I timed
the scrolling through the master branch version of xdisp.c, not each
branch with its version of xdisp.c.