It adjusts and/or eliminates pointless game elements, for example, particles and activitys to increment game execution however much as could reasonably be expected. The OptiFine RK is optimizer pack made for improve performance and improve the default ui with a vanilla look. Made by PhantomRK. New icon, New title, New panorama, New totem texture, New 3D style texture for the buttons. New startup animation, New start screen Pause interface recreated. Chat interface recreated. Updated settings interface. New background (Client Style) New subpacks with different panoramas and textures Various minor changes (Client Style)