There are several things that may have an impact on the game's performance. 
To ensure the app runs as smoothly as possible, please follow this list of suggetions from top-to-bottom:
  • Check the Game Specifications in the App store / Google play store.  (Low-end devices may experience some performance issues by default)
  • Update the game to latest available version. 
  • Close other apps running on background. 
  • Close any VPN and/or Network boosters.
  • Restart your device.