It seems like to every post I was answering: "Well, ..." so this one is no exception.
Well, you are going to kill that mighty with KDE anyway, so my answer-question is why bother installing KDE? The bottom line: KDE choke this beauty in seconds, your mouse will act as if it were under LSD. Get some real windowmanager installed - *box (it is not spelled as Starbucks, but it sounds the same
) - hackedbox, fluxbox, blackbox are keywords.