Lag while playing/Shot meter skipping

First, please check your device for any low power or battery saver settings. If these are turned on, you can try turning them off. Where this is located may vary by device, but are usually located in the Battery section of your device's settings app.

Second, please check the quality slider in the game's settings and making sure that's set to Fastest. 

To find the Quality slider option:

1. Tap the blue line button in the upper right corner of the title screen.
2. Tap the green Settings button.
3. The Quality slider is in the middle, below the Ambient slider and above the Notifications, Vibration, and Measurement options.