bug#17837: 24.4.50; Search very slow

[Eli Zaretskii]

> Date: Wed, 25 Jun 2014 20:10:03 -0400
> From: Richard Stallman <rms@gnu.org>
> CC: 17837@debbugs.gnu.org
> 
> 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?