Ok. I have now figured out what the problem is. The pager plasmaoid makes plasma crash on startup. After removing it, startup sequence is much faster.
Now my problem is that I got no sound on KDE4. I am getting an error message like:
ALSA lib setup.c:555
add_elem) Cannot obtain info for CTL elem (MIXER,'IEC958 Playback Default',0,0,0): No such file or directory
Best Regards
Marcus