bug#23431: 25.0.93; EWW hangs

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> The top of the profile is this:
>
>   - timer-event-handler                                            1149  65%
>    - apply                                                         1149  65%
>     - image-animate-timeout                                        1110  63%
>        image-multi-frame-p                                         1110  63%
>     - url-queue-run-queue                                            39   2%
>
> Any idea why is image-multi-frame-p do expensive?

Hm...  No, I would have expected that to be fast.  It's basically just a
call to `image-metadata', isn't it?  And that should be caching the
data, I think?

Hm...  That function basically just does:

      struct frame *f = decode_window_system_frame (frame);
      ptrdiff_t id = lookup_image (f, spec);
      struct image *img = IMAGE_FROM_ID (f, id);
      ext = img->lisp_data;


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