slackware... from what i remember about slackware, its an all or nothing installer..you selec kde, and unless you have patience to go through everything individually, selecting install or not on optional packages, all of kde will be installed.
try to install it the gentoo (greatest distro ever created in the entire history of time) way.... of course slackware does not have emerge so you will have to do it all manually....
export CFLAGS="-O3 -march={your cpu} -fomit-frame-pointer -pipe"
export CXXFLAGS="-O3 -march={your cpu} -fomit-frame-pointer -pipe"
and compile QT, KDELIBS and KDEBASE.
that will give you a lean KDE.
also, look into pre-linking.
or be a porn star.. and switch to gentoo