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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: macOS metal rendering engine in mac port
Date: Thu, 27 May 2021 20:47:57 +0300
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Cc: mituharu@math.s.chiba-u.ac.jp, aaronjensen@gmail.com, emacs-devel@gnu.org
To: Alan Third <alan@idiocy.org>
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 May 2021 18:40:54 +0100)
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> Date: Thu, 27 May 2021 18:40:54 +0100
> From: Alan Third <alan@idiocy.org>
> Cc: aaronjensen@gmail.com, emacs-devel@gnu.org,
> 	mituharu@math.s.chiba-u.ac.jp
> 
> > > 3.7s 3.7s 4s
> > 
> > So I'm sure I understand: it takes you just 3 seconds to scroll
> > through all of xdisp.c, top to bottom, with the command below?
> > 
> > (defun scroll-up-benchmark ()
> >   (interactive)
> >   (let ((oldgc gcs-done)
> >         (oldtime (float-time)))
> >     (condition-case nil (while t (scroll-up) (redisplay))
> >       (error (message "GCs: %d Elapsed time: %f seconds"
> >                       (- gcs-done oldgc) (- (float-time) oldtime))))))
> 
> Yes, although the initial run through, where the file is font-locked,
> is more like 22 seconds. I didn't count that, am I measuring this wrongly?

Yes, I meant to measure just the first scroll, and restart Emacs each
time before another measurement.

So maybe we were comparing apples and oranges all the time.