Translucency in KDE too slow (Composite)

["[KS]" <lists04@fastmail.fm>]

Hello all,

I was trying to enable translucency(in KDE) on my debian unstable box.
After editing the xorg.conf for using the composite extension, I
restarted X and it worked. However, I was a bit dismayed with the
performance. It is so slow that I can actually "see" that KDE is trying
to redraw a window. Are there any specific settings that I need to
adjust to get a better performance?

My system is a PIV 2.0GHz based machine with 256+512MB RAM and a Nvidia
Geforce 5700LE (256MB vRAM), KDE is 3.5.2.

ii  libxcomposite1   6.9.0.dfsg.1-6   X off-screen compositing library
ii  libxdamage1      6.9.0.dfsg.1-6   X region 'damage' library

thanks,
KS