Hi, Org mode lost the ability to reuse already generated latex preview images in commit 27101a3e0ee7. Now it just regenerates all of them every time.
I don't see a reason for removing this feature (am I missing something?), so here is a little patch reintroducing that feature. I'm also mailing the author of that commit. Abdó Roig-Maranges.
>From cd284a858a653c28e42b09fa07f172172ceba510 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Abd=C3=B3=20Roig-Maranges?= <abdo.r...@gmail.com> Date: Tue, 23 Oct 2012 18:44:24 +0200 Subject: [PATCH] org.el: Don't re-generate latex previews if already present * org.el (org-format-latex): Do not re-generate a latex preview if the image already exists. This feature was lost in commit 27101a3e0ee7 --- lisp/org.el | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/lisp/org.el b/lisp/org.el index ee4c70e..3ba1ab8 100644 --- a/lisp/org.el +++ b/lisp/org.el @@ -17636,8 +17636,9 @@ Some of the options can be changed using the variable (unless checkdir ; make sure the directory exists (setq checkdir t) (or (file-directory-p todir) (make-directory todir t))) - (org-create-formula-image - txt movefile optnew forbuffer processing-type) + (unless (file-exists-p movefile) + (org-create-formula-image + txt movefile optnew forbuffer processing-type)) (if overlays (progn (mapc (lambda (o) -- 1.8.0.2