I had noticed that with large agendas (several hundred items), any
command that changes and re-displays the current item is slow. For
example something like changing priority with Shift-Up/Down key, can
take a second or two.
Most of that time is spent in (org-agenda-finalize) call, which is
responsible for putting finishes touches, such as fortifying [#A] as
bold when you change priority from [#B].
It seems that even if only single line had changed, the
(org-agenda-finalize) still processes entire agenda buffer, which is
the cause of the slowness.
Following patch changes (org-agenda-change-all-lines) to call
(org-agenda-finalize) for each line changed, with agenda buffer
narrowed to just that line, and it speeds up redisplay of current item
a lot, the Shift-Up changing of priority can almost keep up with
keyboard repeat rate on large agendas.
I was running with this patch for a month, and did not noticed any
problems so far.
From 432293f3c55308f3f76b0c5284ca696fb11f10ea Mon Sep 17 00:00:00 2001
From: Max Mikhanosha <m...@openchat.com>
Date: Fri, 28 Sep 2012 09:02:07 -0400
Subject: [PATCH] speedup redisplay of agenda item after change
* lisp/org-agenda.el (org-agenda-change-all-lines): speedup
refresh of a single line of agenda by narrowing the agenda
buffer just that line before calling org-agenda-finalize-
---
lisp/org-agenda.el | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/lisp/org-agenda.el b/lisp/org-agenda.el
index ea607eb..30dd5bf 100755
--- a/lisp/org-agenda.el
+++ b/lisp/org-agenda.el
@@ -8079,9 +8079,11 @@ (defun org-agenda-change-all-lines (newhead hdmarker
undone-face done-face))))
(org-agenda-highlight-todo 'line)
(beginning-of-line 1))
- (t (error "Line update did not work"))))
- (beginning-of-line 0)))
- (org-agenda-finalize)))
+ (t (error "Line update did not work")))
+ (save-restriction
+ (narrow-to-region (point-at-bol) (point-at-eol))
+ (org-agenda-finalize)))
+ (beginning-of-line 0)))))
(defun org-agenda-align-tags (&optional line)
"Align all tags in agenda items to `org-agenda-tags-column'."
--
1.7.11.rc0.100.g5498c5f
