Debian/KDE3.5 playing dvd is too slow
I've installed Debian etch on my Thinkpad T43 some days before. Gnome was installed by default. Then I installed libdvdcss2 package and could play dvd. All was ok.
Now I completely reinstalled my system, but don't choose any Desktop Environment. Next I manually installed kde (apt-get install kde) and xorg packages. I have started kde successfully and installed libdvdcss2. But now I have very strange problems with playing dvd - computer is slow down while playing film, audio is ok, but video is.. slow and loose half of frames. It get better when I make player window is very small and it's almost impossible to view film in fullscreen mode.
I have installed ati drivers from www dot ati dot com, but nothing changed.
Please, help me to solve this problem.
P.S. It seems not depends on dvd player. Now I use Kaffeine, but the same result was on standard K players.