I've received a few reports from users about poor performance of app running on Samsung Galaxy S4, the models w/ Snapdragon chips. Strangely enough, it runs perfectly smooth on Nexus4 w/ similar chip - Snapdragon 4. After googling for possible performance bottlenecks I've found some clues that this can be related to OpenGL drivers.
Could you please download app and tell:
1. If animation of live wallpaper itself is smooth.
2. If animation of launcher UI is smooth.
3. Firmware details.
You can check performance with postprocessing set to Medium and Off - this can be changed in live wallpaper's settings.
Google Play link (app is free):