What do you mean? Running the Live Distro?
So far the reviews that I have read says that is faster. I can say, is better than 2009.1 as far speed.
Mandriva uses by default KDE and is version 4. The "problem" with KDE Version 4 is that is for more capable systems since has a lot of eye candy. Also comes with GNOME that is more Lightweight. Also has XFCE desktop environment for older systems.
What people seems not to grasp is the Desktop Environments.
Linux is a Kernel, so do not treat it like Windows (you have no choices on Windows, get stuck with what you get).
Other developers create Desktop Environments that works on Linux.
KDE got heavier since PC now days are way more capable and keeping with the times. As an example, do not expect to run Vista on 256 MB of RAM, see my point?
When you install Mandriva during install, there is a choice of Desktop Environments so pick wisely and know what you want. Is as simple as clicking on the radio button.
You do not get that choice on MS, they tell you what you want !
So in one DVD install, you have a choice of KDE, GNOME, XFCE, etc...
Now on the Life Distros, there are 2 choices, one is KDE and GNOME (there is so much that you can cramp on a DVD) so on the DVD name one says Mandriva KDE and Mndriva GNOME [ http://www2.mandriva.com/downloads/?p=linux-one ].
If you are a Ubuntu fan pick the one with GNOME if you like Kubuntu pick the one with KDE, but is KDE 4 (a bit heavier than KDE version 3).
If you want to install the full disto, it does not matter, just get the Free Version or pay 60 Euros for the one with the Commercial License drivers, firmware, software and such.