Hehe, what kind of people cares about console scrolling speed, does a benchmark about it, and worries about the result???
The speed of Konsole in my machine is fast, I don't feel any slowness.
KDE 4.4 is a very nice release, I would switch from GNOME to KDE, but I'm happy because I already use it.
It is even possible to configure KDE to look as GNOME, with some plasma widget in KDE-look.org