Lubuntu Eoan dated Oct 6 was not affected by this bug. The current daily iso file (the ‘final’ candidate) boots very slowly (when cloned into a live drive). It is waiting for 1 min 30 seconds.
This bug affects also Xubuntu, but not standard Ubuntu desktop, which means that Lubuntu (and Xubuntu) live boot slower than the heavier standard Ubuntu. I hope we have time to fix this issue.
I have created this bug report, but I am not sure that I am blaming the correct culprit (program package).
I have also created this new thread about it at the Ubuntu Forums.
Please have a look at it (test that it affects you too, and try to find out where to start looking for a bug-fix.
Edit: Could this bug report about Kubuntu be related?
Edit 2: added this photo of the waiting screen (booted without ‘quiet splash’)