Comment 74 for bug 969489

I have same problem.
On 12.04 it was even acceptable - freezing from time to time. But after upgrading to 13.04 I have 3 to 4 freezes before successfull lightdm load.
Patching /etc/init/lightdm.conf helped me for now - but slowing down fastboot is a little pity.

Let me know if I could help (logs/configs/etc).