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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: lax matching is not a great default behavior
Date: Tue, 01 Dec 2015 22:04:12 +0200
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> Date: Tue, 01 Dec 2015 22:01:04 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: emacs-devel@gnu.org
> 
> The first match is almost instantaneous here; it's the next one,
> especially if it fails, is slow.
> 
> So it doesn't seem to be the search itself, it's something else that's
> at work here.

Seems to be lazy-highlight.  Set isearch-lazy-highlight to nil, and
Bob's your uncle.