Re: Redisplay slower in Emacs 28 than Emacs 27

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: Eli Zaretskii <eliz@gnu.org>,  emacs-devel@gnu.org
> Date: Mon, 07 Dec 2020 19:47:35 +0100
> 
> Would it be possible for you to run the benchmarks on the current trunk,
> with and without that "!"?  Because I just don't understand why
> disabling the image cache would make Emacs slower.

Btw, there could be a way to speed up equal_lists, I think.  It
compares image specs, not just any 2 lists, right?  An image spec
always starts with the symbol 'image'.  So it should be enough to
compare only the list members starting from the second one.  The image
specs of the tool-bar buttons have 9 members, so this might yield an
11% speedup.