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Major slowdown in set-buffer-multibyte

From: Stefan Monnier
Subject: Major slowdown in set-buffer-multibyte
Date: Mon, 25 Feb 2008 10:32:42 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (gnu/linux)

I recently tried to open a zip file (6MB, nothing enormous), and it took
me a while (1minute).  Now, admittedly, I have all kinds of assertions
and de-optimizations enabled, so I recompiled the trunk normally to
check it wasn't my own fault, and the problem is still present.
ELP tells me that set-buffer-multibyte is called twice and that the two
calls take a total of 9s, with Emacs-22 opening the file is instantaneous.

By hitting C-g a few times it seems that the problem is in the
(set-buffer-multibyte 'to) call (i.e. converting from unibyte to
singlebyte rather than the other way around).

Could someone look into it?


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