Empty flat terrain: low performance on iPhone 4G

Target Platforms Mobile
1

I have created an empty scene with default terrain, no textures assigned, no lights, target 60 FPS. Building on the latest Unity version 4.1.2f1 (trial version) and Xcode 4.6.1 (4H512) gives a very strange result: running this empty project on iPhone 4G (not S) already slows down to 25 FPS. This problem doesn’t appear on iPhone 5 and iPad 2.

Bottleneck: cpu-waits-gpu for ~35ms

Assigning default diffuse material to the terrain fixes the problem, but when I apply textures the terrain looks ugly.

Could someone give me a hint, what’s going wrong?

2

If it helps, the iPhone 4G is on the latest iOS 6 version. Could it be that trial Unity version misses some components like shaders for terrain or something else?

Maybe its a good idea not to support iPhone 4G at all? Prototype of my game runs stably at 60FPS on iPhone 5G and 30FPS on iPad2 anyway.

I would be grateful for any tips.

3

If you’re talking about the iPhone 4, that was the case since day 1. All of Apple’s 2010 iOS devices had unpowered GPUs.