Compiz on start-up to fixing slow GTK menus

To start compiz on KDE start and fix slow GTK menus when there are two screens (with --only-current-screen option)

In ~/.kde/Autostart create compiz.desktop, which contains:

[Desktop Entry]
Version=1.0
Encoding=UTF-8
Name=compiz.desktop
Exec=__GL_YIELD="NOTHING" compiz --replace --only-current-screen --indirect-rendering
StartupNotify=false
Type=Application
X-KDE-Autostart-after=kdesktop