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

[Eli Zaretskii]

> Date: Fri, 04 Dec 2020 20:33:21 +0000
> From: Gregory Heytings <ghe@sdf.org>
> cc: stephen.berman@gmx.net, acm@muc.de, emacs-devel@gnu.org
> 
> >> I bisected this, and the origin of the regression is commit 
> >> 365dad197bac5deec9244fd9c189d23c46c99b31, which changes the default to 
> >> "use 'static' instead of 'extern inline' [in C headers] because 
> >> 'static' typically has better performance for Emacs".  With -Og or -O0, 
> >> the benchmark takes 67 seconds, with -O1 or above (-O2 is the default) 
> >> it takes 25 seconds.
> >
> > Thanks, then I think there''s no issue here, and we can stop wondering 
> > about the difference in performance.
> 
> There's no issue indeed, but it might make sense to merge commit 
> b9b32074cecb0e0d20cf527eadacbb0b7f5cced9 into emacs-27.

No, because emacs-27 only receives bugfixes at this time, and safe
ones at that.