Re: Redisplay slower in Emacs 28 than Emacs 27

[Lars Ingebrigtsen]

Gregory Heytings <ghe@sdf.org> writes:

> I was surprised, too.  What I do know is that I observed this 10-15%
> slowdown consistently, on that particular revision, so it cannot be
> accidental.  As you see on the graphs, I tested about hundred
> different revisions, each of them ten times.

I have no explanation for that -- but if you add the "!" back, you
disable the Emacs cache completely.  Try it, and load a large image with

emacs -Q some-megapixel-image.jpg

and Emacs will become unusable, because it'll re-decode the image for
each update.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no