The main issue is these lines in your XorgLog:

(EE) intel(0): [drm] Failed to open DRM device for : No such file or directory
(EE) intel(0): Failed to become DRM master.

I've been seeing this bug occasionally on my system too, since the new
upstart stuff. When booting, KMS fails to set the mode, so I see boot
messages in low-res text mode. GDM then starts, but as you say, X is
very slow, and I think you'll also find that anything that tries to use
DRM (eg. playing a movie in Totem or VLC) will cause X to crash.

Somebody else reported similar problems as part of
https://bugs.launchpad.net/ubuntu/+source/udev/+bug/430654 and it was
suggested that a separate bug report be opened. I'm not sure if this is
that separate bug report....

-- 
xorg is slow since new upstart
https://bugs.launchpad.net/bugs/431178
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