How to reproduce:

1. Open attached project
- Make sure that Metal is the selected Graphics API in the Player settings
2. Build to iOS and open the project in Xcode
3. In the Scheme settings enable the appropriate GPU Frame Capture setting (Metal in this case)
4. Deploy to device
5. In Xcode click the Camera icon to capture a frame
6. Once it loads, select the FPS tab at the top
- Make a note of the performance stats there (screenshot)
7. Repeat from step 2 but with OpenGLES3 instead of Metal
8. Compare the stats between GLES3 and Metal, when running on the same device
- Note how the Metal performance is worse than GLES3

- Reproduced in Version 5.2.4f1 (98095704e6fe), Version 5.3.4f1 (fdbb5133b820), Version 5.4.0b18 (cdaae1c8e465) on an iPad Pro (iOS 9.2.1)