Re: Is Elisp really that slow?

[Jean Louis]

* Emanuel Berg via help-gnu-emacs <help-gnu-emacs@gnu.org> [2019-05-30 14:09]:
> (require 'dired)
> (defun su-edit ()
>   "Edit the current buffer file as superuser."
>   (interactive)
>   (let*((window-start (window-start))
>         (point        (point))
>         (mark         (when mark-active (mark)))
>         (path         (or dired-directory
>                           (file-truename (buffer-file-name)) ))
>         (sudo-path    (sudo-root-path path)) )
>     (find-alternate-file sudo-path)
>     (when mark (set-mark mark))
>     (goto-char point)
>     (when dired-directory (dired-previous-line 1))
>     (set-window-start nil window-start) ; the selected WINDOW
>     )) ; [1]

let*: Symbol’s function definition is void: sudo-root-path

Then I found out that tramp is offering it with C-x C-f /sudo://etc/asound.conf