[O] Commit bb2848 causes performance problems

[Marcel van der Boom]

commit bb28480169558a183fab2330476a49b4fb1aec46 causes major
performance problems in my install.

GNU Emacs 24.0.92.3 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.6)

The relevant change:

diff --git a/lisp/org.el b/lisp/org.el
index 587d298..f670787 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -6301,6 +6301,8 @@ in special contexts.
          (org-list-set-item-visibility (point-at-bol) struct 'children)
        (org-show-entry)
        (show-children)
+       (when (memq 'org-cycle-hide-drawers org-cycle-hook)
+         (org-cycle-hide-drawers 'subtree))
        ;; Fold every list in subtree to top-level items.
        (when (eq org-cycle-include-plain-lists 'integrate)
          (save-excursion

I isolated this commit by using 'git bisect'. 

The problem is very noticeable on a reasonably large org file (about
15000 lines). The behaviour I am seeing is a delay in cursor movement
(and cpu load increasing for the emacs process) when the point is on
the higher outline levels. The delay is less when moving the point
further down the tree, presumably because the subtree below that
particular point gets smaller.

By commenting out the two lines marked in the diff, the delay
disappears completely.

Do I have a configaration error, or is this a bug?

marcel

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Marcel van der Boom  -- http://hsdev.com/mvdb.vcf
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