Re: macOS metal rendering engine in mac port

[Eli Zaretskii <eliz@gnu.org>]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Thu, 27 May 2021 12:37:33 -0700
> Cc: Alan Third <alan@idiocy.org>, emacs-devel@gnu.org, 
> 	YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>
> 
> > As for times: do you want an optimized or an unoptimized build?  Does
> > it matter if it's Emacs 27 or 28?  And does it matter that my builds
> > are 32-bit builds --with-wide-int, which slows down Emacs by about
> > 30%?  When I know which numbers you want to see, I will produce them.
> > (Of course, it is easier for me to produce numbers from a build I
> > already have, otherwise I'd need to build it first.)
> 
> All my recent times are on unoptimized and on Emacs 28. I'm building
> the default architecture on macOS, which I imagine is 64 bit.

In an unoptimized 32-bit build --with-wide-int:

  . Without line numbers: 15.9 sec.
  . With line numbers: 19.7 sec.

The times are quite consistent, with jitter of less than 0.1 sec.

Note that I don't consider this (i.e. scrolling through a buffer that
was already completely font-locked in advance) an important use case
for the redisplay purposes, because with today's JIT font-lock this
almost never happens.