What are the Graphics, Performance and Performance Plus options, and how do I enable them?
You can select Graphics or Performance options to choose either better graphical detail or higher frame rate. On the 3rd generation iPad Pro you can also select Performance Plus to opt for an even higher frame rate.
These options can be accessed via the Main Menu under Options → Options & Extras → Optimisation, or via the Pause Menu under Options → Optimisation.
Please note: the Graphics and Performance options are available on the iPhone 8 or later and all supported iPads. Performance Plus is only available on the 3rd generation iPad Pro.