Considering the age of Emacs's source code, I'd imagine there would be a lot of code that used to be optimal when it was written, but isn't any more (Sort of ho

Considering the age of Emacs's source code, I'd imagine there would be a lot of code that used to be optimal when it was written, but isn't any more (Sort of how replacing a lot of instances of Duff's Device in Xfree86 with memcpy has sped it up).