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Redisplay regression

From: Chong Yidong
Subject: Redisplay regression
Date: Wed, 21 Oct 2009 15:28:54 -0400

A serious performance regression seems to have appeared on trunk
sometime during the last two days.  In particular, repainting the screen
on X now takes vastly longer than before.  Anyone who made a change to
the Emacs internals during this last few days, please double-check your

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