bug#65491: [PATCH] Improve performance allocating vectors

[Eli Zaretskii]

> From: Ihor Radchenko <yantar92@posteo.net>
> Cc: Stefan Monnier <monnier@iro.umontreal.ca>, 65491@debbugs.gnu.org
> Date: Sat, 26 Aug 2023 07:27:27 +0000
> 
> If you know any useful code that makes heavy use of vector allocation, I
> can also benchmark it.

Look in the area of encoding/decoding and automatic compositions --
these tend to use vectors quite a lot.  For example, rendering text
that uses a script where most of characters are composed, such as
Arabic or Hangul (Korean) should allocate vectors.  Note that this is
the case where we call Lisp from C display code.