If complex effects cause stuttering, reduce the preview resolution in Edit > Preferences > Playback or use the "Render Video Preview" option.
Since Photodex is no longer in business, several online features are unavailable: Photodex ProShow Producer 9.0.3782 Effect Pac...
The following official packs were last compatible with this version (list derived from Photodex archives): If complex effects cause stuttering, reduce the preview