> Yeah, Konsole in KDE4 is one of my frustrations.
> It's just a lot slower, visibly using shift + left/right.
> I use KDE and Emacs all day.
It isn't universally slower. In particular with a 'friendly' set of hardware (Intel graphics) it should be much faster than in KDE 3.5 for general usage, in particular scrolling and working with large windows of text. There were problems with very poor performance under NVidia or when using bitmap fonts. I believe the NVidia problems are fixed with the latest drivers but the bitmap font bug remains.
Either way, if you're using the terminal heavily then please do take a few minutes to report the bug on bugs.kde.org or email firstname.lastname@example.org.