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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 21:29:32 +0200
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> Date: Fri, 25 Jan 2013 11:12:43 -0800 (PST)
> From: drain <aeuster@gmail.com>
> 
> Do you guys experience lag when you open these large files? For me, the
> deeper I get into a nested heading, the less lag there is, eventually
> lag-free. But when I am at the overview, it starts to get pretty slow
> around 10 MB.

Because what is one line on display may be many lines of text in the
buffer, and redisplay needs to traverse them all.