KDE 4.2 on kubuntu

Hi all. I installed kde 4.2 on my kubuntu box from kubuntu kde experimental repository.
You can install it following instructions from following link.

http://www.kubuntu.org/news/kde-4.2
I find it much better than beta releases and in one word awesome. But it still uses some kde 3 apps like knetwork manager, conversation .. which are replaced completely in jaunty. KDE guys have developed a nice network manager plasma applet which integrates controlling of your wired and wireless network to plasma ( the desktop shell for kde 4 series) itself. Quassel is the new irc client for kubuntu which is written in qt4. I installed it but haven't tried.

But sometimes I find my system very slow. Don't know what could be the reason. I am planning to install jaunty alpha and format my system to ext4 file system, heard it has better performance that ext3.

I am planning to start some development work for kde 4, if God blesses me with enough time and enthusiasm. But I seriously want to contribute back to the community.