Re: X performance suffers under emacs 21.1.1

[Gerd Moellmann]

Richard Stallman <address@hidden> writes:

>     > Incidentally, what you describe is already implemented and exactly the
>     > way you proposed: clear_image_cache is called from redisplay,
>     > indirectly, when it clears the face cache, and clears images that
>     > haven't been displayed for 30 minutes.
> 
> Why does clearing the face cache clear the image cache?
> Is there a reason why that must be done, or is it a heuristic
> attempt to clear the image cache more often?

It's a heuristic.