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

[Gregory Heytings]

> > 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.

I did not know that an Emacs 27.3 release was not planned.  In that case, 
the emacs-27 branch will forever remain slower with -Og and -O0 (at least 
on GNU/Linux 64-bit platforms with GCC).