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From: "Ami Fischman" <ami@fischman.org>
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Subject: size of gnus-undo-actions
Date: Fri, 26 Dec 2008 16:41:30 -0800
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What is considered a reasonable size for gnus-undo-actions
(buffer-local variable in *Group*)?
For a session with uptime 6d18h I've got a 237-element
gnus-undo-actions value that takes 12MB to prin1, or almost 50KB per
recorded action.  Quitting gnus frees up over 1.3MB of lisp heap
(according to memory-usage.el).  Does gnus-undo-actions really need to
be so large?

FWIW, I used this to get the above numbers:

(save-excursion
  (set-buffer "*Group*")
  (let ((len (length gnus-undo-actions))
        (size (length (prin1-to-string gnus-undo-actions)))
        (limit gnus-undo-limit))
    (message "Length:%d, size:%d, limit:%d"
             len size limit)))

Which printed:
Length:237, size:12037804, limit:2000

Cheers,
-a