These effects are available for G5 and Intel processor.
Some are supported by PowerPC G4 with Powerboost to add support of the simple effects on your G4. "Cack-drop effects" will still be unavailable for G4 and G5.
If you want to remove all effects, run the installer or remove files in /Library/Compositions
Thanks to :
- qPatches effects (http://www.qarl.com/menu/qPatches/)
The new effects of the version 2.0