Comment 26 for bug 137401

To be sure, this is not only a KDE issue. I am also having this problem on Gnome: No Compiz --> *slow* OpenOffice.org; Compiz --> Fast. Let me know if it's useful to provide any other information...

Gnome window manager
Running Compiz + restricted ATI drivers, Desktop Effects enabled
Ubuntu Gutsy Gibbon 7.10 fresh install
Linux machname 2.6.22-14-generic #1 SMP Tue Dec 18 08:02:57 UTC 2007 i686 GNU/Linux
Compal CL56 notebook/laptop, Pentium M
Installed/using "xserver-xgl" in order to work around "driver bugs" (re: Chris Halse Rogers wrote on 2007-10-21)
ATI MOBILITY RADEON 9600/9700 Series
direct rendering: No (If you want to find out why, try setting LIBGL_DEBUG=verbose)