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From: Decebal <cldwesterhof@gmail.com>
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Subject: Re: Disable undo in batch mode
Date: Sun, 11 Oct 2009 07:22:58 -0700 (PDT)
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On Oct 11, 12:14=A0pm, Xah Lee <xah...@gmail.com> wrote:
> (defun my-process-file (fpath)
> =A0 "Process the file at path FPATH ..."
> =A0 (let ()
> =A0 =A0 ;; create temp buffer without undo record.
> =A0 =A0 ;; first space in temp buff name is necessary
> =A0 =A0 (set-buffer (get-buffer-create " myTemp"))
> =A0 =A0 (insert-file-contents fpath nil nil nil t)

I am afraid that this does not work. When using:
        (switch-to-buffer (find-file-noselect input-file t t))
        (buffer-disable-undo)
my script takes 24 seconds.
When I change those two lines to:
        (set-buffer (get-buffer-create " myTemp"))
        (insert-file-contents input-file nil nil nil t)
it takes 592 seconds. About 25 times as long.