X REALLY slow when external monitor plugged in at boot

Hello all, I am running Kernel 2.6.29.4 with xf86-video-intel 2.7.1-1, Xorg 1.6.1.901 and EXA acceleration (no KMS) on my thinkpad T61 with an Intel X3100. (I keep up-to-date stable.)
Whenever I have the VGA monitor plugged in to my laptop at boot time, when I log in using GDM it takes FOREVER to start XFCE. Super slow motion.
If I wait to plug in the monitor until after X starts, and then type 'xrandr --auto' there is no problem whatsoever.
In both cases, X correctly sets the video mode with no problem. Any idea what is causing the slowdown? Thanks!

No, but I haven't tried in a while since I don't use an external monitor currently. Is it slow all the time, or only if you connect the monitor before X boots? Do you have intel graphics?

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