I'm still a systemd noob but I've heard there are ways to avoid blocking on network connectivity. Hopefully you'll forget about that part.

udev-settle seems to be a workaround LVM not being event driven enough http://freedesktop.org/wiki/Software/systemd/Optimizations/

https://bbs.archlinux.org/viewtopic.php?id=189369

Using arch, systemd boot time is now almost inexistant (but I have a tiny system with a SSD).