Re: Redisplay slower in Emacs 28 than Emacs 27

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> It may make redisplay faster, but it will produce confusing effects if
> an identical spec is constructed from the same or identical elements:
> Emacs will think the image is not in the cache.  Sounds like a lot to
> pay for a minor speedup, to say nothing of backward compatibility.

It's a major speedup for :data images, which is what you'll find in eww
and mail readers.

And we've been using equal_lists in Emacs 28, which is incompatible in
much the same way, and we've seen only one thing that needed tweaking
because of that.

-- 
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   bloggy blog: http://lars.ingebrigtsen.no