Maybe it made sense to rewrite apropos.el in C for speed in 1991, but
today the speed increase would not outweigh the maintenance burden.
* lisp/apropos.el: Delete outdated comment.
;; The ideas for this package were derived from the C code in
;; src/keymap.c and elsewhere. The functions in this file should
-;; always be byte-compiled for speed. Someone should rewrite this in
-;; C (as part of src/keymap.c) for speed.
+;; always be byte-compiled for speed.
;; The idea for super-apropos is based on the original implementation
;; by Lynn Slater <lrs@esl.com>.