bug#45224: 28.0.50; eww and GIFS (cpu usage shoots through the roof)

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Mon, 11 Apr 2022 18:49:46 +0200
> Cc: Madhavan Krishnan <krishnanmadhavan000@gmail.com>, 45224@debbugs.gnu.org
> 
> And as I was looking at the image stuff anyway, I've now gone ahead and
> added filtering for the animation elements from the image cache.
> 
> In my test GIF image, Emacs used to use 30% CPU when animating it.
> Creating the GIF cache took that down to 3%.  Fixing the first-level
> image cache takes that down to 1%.
> 
> So finally Emacs should be usable when displaying a buffer with a bunch
> of animated images.  :-)

Great, thanks!