iPod touch 4 vs iPhone 4 performance

I'm working on a game for iOS platform. It's running smooth on 60 FPS on iPhone 4 iOS 4.3, iPad iOS 4.3, iPad2 ios 4.3, but it gives only 30-34 FPS on iPod touch 4 with iOS 5.As i know the hardware on iPhone 4 and iPod touch 4 is the same except RAM (512 iphone, 256 ipod). Is it a normal behavior and if not where can be the problem? Thanks

Some additional info:

the game is using openGL ES 2.0

it's a 2D game and if i remove background layers from rendering ipod can run at 60 FPS. So i think the problem is related to GPU but I have no idea how to fix it.


I've tried on the other ipod 4 32 GB running iOS 4.2.1. No problems were detected. Strange

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