FYI Speedup of publish command in master

[Gustav Wikström]

Hi,

In a similar vein as the speedups of scanning for IDs that was made a while 
back, there now is a speedup for org publish as well. Soon to be pushed to 
code.orgmode.org (we're still using that, aren't we?) with commit aa0fa8c75.

The speedup is seen when scanning through files to decide if an existing cache 
can be used or not.

A note on the topic, fwiw. Loading an Org mode file using find-file is very 
slow. So when there is a reason for looking through the content of Org mode 
files, or any file for that matter, and there is no reason for triggering 
hooks, consider instead inserting the content of the file in a delay-mode-hooks 
macro within a temporary buffer (using the with-temp-buffer macro).

Example:
*Instead of*:
(find-file path-to-file)
;; do stuff
(...)
;; clean up state
(kill-buffer ...)

*Consider*:
(with-temp-buffer
  (delay-mode-hooks
    (insert-file-contents path-to-file)
    ;; do stuff
    (...)))

Best
Gustav