Is it just my feeling or this combination is so f***in responsive?! More into the kernel or the KDE? Hmm, better try with older kernel later ..
Anyway, I just change my desktop background. With a transparent panel I got a smooth blend effect .. Brrr, my kicker is on the snow!!

PS:
My former title was misleading
.. it was KDE 3.5.2
.. well, it’s KDE 3.5.1