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From: Chong Yidong <cyd@stupidchicken.com>
Newsgroups: gmane.emacs.devel
Subject: Re: Low redisplay performance (23 regression)
Date: Tue, 21 Apr 2009 16:53:48 -0400
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Cc: Juanma Barranquero <lekktu@gmail.com>, Eli Zaretskii <eliz@gnu.org>,
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To: David Reitter <david.reitter@gmail.com>
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David Reitter <david.reitter@gmail.com> writes:

> Without face-remapping and header line, I estimate the slowdown is
> about 20% for me, a noticeable difference.

Try something for me:

  M-: (setq mode-line-format "") RET

This removes everything from the mode-line.  Does it make any
difference?