Subject: bug#17837: 24.4.50; Search very slow

From: Eli Zaretskii <[email-masked]>
Date: Thu, 26 Jun 2014 17:59:15 +0300

> Date: Wed, 25 Jun 2014 20:10:03 -0400
> From: Richard Stallman <[email-masked]>
> CC: [email-masked]
> 
> The problem is not simple font-lock.  It is due to searching for
> other matches for the search string.

If this were true, then setting isearch-lazy-highlight to nil ought to
make Isearch significantly faster for you.  I tried that and didn't
see any noticeable difference; do you?