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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: recover file after crash
Date: Fri, 25 Jan 2013 22:44:00 +0200
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> Date: Fri, 25 Jan 2013 12:31:57 -0800 (PST)
> From: drain <aeuster@gmail.com>
> 
> In any case, I sent Valentin a large file that tends to lag

If it has no or few empty lines, adding empty lines (e.g., before
top-level headings) might dramatically improve performance in very
large buffers.