GHacks.net posted a guide about upgrading Fedora and Ubuntu to KDE 4.5

For the longest time I have shrugged off KDE 4 because of poor performance. But since 4.4 I have noticed a rather vast leap of the improvement chasm. Now, 4.5 is out and the leap went lunar! That’s right, KDE has finally reached a level of usability and performance that rivals any of its competition (so long as its competition isn’t one of the very light weight window managers, but that’s comparing apples to chocolate chip cookies). For all of those who want to experience this amazing improvement, but don’t want to have to wait until your distribution of choice releases with KDE 4.5 in all its glory, fear not…there is a way.

In this article I am going to show you how to upgrade both Fedora and Ubuntu so that your KDE becomes as snappy and reliable as it was back in the good ol’ days of 3.5.

  Update KDE to 4.5 and experience true improvement