Does anybody know the score on concurrent booting in Lucid Lynx?

[struggle4progress]

Here's a pre-Lucid tip:

Concurrent Booting, make full use of your multi-core processors during boot time
http://n00bsonubuntu.com/software/concboot

Concurrent Booting: make full use of your dual-core, multithreaded or hyperthreaded processors in Ubuntu
http://gizvillage.blogspot.com/2009/04/concurrent-booting-make-full-use-of.html

But the changes in 10.04 may make it obsolete:

Después de instalar Ubuntu 10.04 Lucid Lynx
http://lavidalinux.com.ar/2010/05/despues-de-instalar-ubuntu-10-04-lucid-lynx.html

Acelera el arranque de Ubuntu en máquinas con varios nucleos
http://portalubuntu.blogspot.com/2010/05/acelera-el-arranque-de-ubuntu-en.html

I can't find much on the web about this recommended change from "CONCURRENCY=none" to "CONCURRENCY=startpar." The file /etc/init.d/rc is a script containing a number of instances "CONCURRENCY=none," and I'm not sure I want to rewrite it with sed unless I have some idea what I'm doing

[struggle4progress]

1. Report: Well, I finally tried it on a quadcore AMD

Saved copies of /etc/init.d/rc and /etc/default/rcS as /etc/init.d/rc.old and /etc/default/rcS.old with cp -a so I could recover if necessary, then ran

sudo sed -i 's/CONCURRENCY=none/CONCURRENCY=startpar/g' /etc/init.d/rc && sudo sh -c "echo 'CONCURRENCY=startpar' >> /etc/default/rcS"

No obvious problem on either restart or restart after complete shutdown. I don't think it's done any harm. It's hard to tell if it's done much good: this rig already has system and app files on an ssd and the rest of the stuff is on a raid 0, so it booted pretty fast anyway. But it's also got an nVidia card, so a known problem with plymouth slows the boot

[struggle4progress]

2. Tried it on a dual socket machine. Again, if there's any improvement, it's slight.

Majority of boot time is mobo-related, and this can't help that