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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: What's your favourite *under_publicized* editing feature
	of	Emacs?
Date: Sat, 29 Jan 2011 17:00:55 +0200
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> From: Oleksandr Gavenko <gavenkoa@gmail.com>
> Date: Sat, 29 Jan 2011 16:46:33 +0200
> 
> It is possible read only portion of file by Emacs
> and don't load all file content into buffer?

Yes, see the doc string of insert-file-contents.

> Many hex viewer in read-only mode allow open large files without
> performance penalty. Emacs don't.

It won't help in this case, because the performance problems Stefan
mentions make his nhexl-mode unusable even on relatively small
buffers, unfortunately.