frame rate difference for ipad2 and ipad3 device

Well, they have almost the same hardware specs, but the resolution on the ipad3 is 4 times that of ipad 2. So it's to be expected that the same (or very very similar) CPU/GPU combo is to have more trouble rendering at higher res.

If you look at the hardware specification for both these:

iPad2:

• System Chip: Apple A5

• GPU: PowerVR SGX543MP2 (This is dual core)

• RAM: 512 MB

• Resolution: 1024 x 768 pixels

iPad3:

• System Chip: Apple A5X (A high performance variant of Apple A5)

• GPU: Quad core PowerVR SGX543MP4

• RAM: 1024 MB

• Resolution: 2048 x 1536 pixels

So theoretically it has doubled the processing power from iPad2 to iPad3 with it's GPU.

But again since the resolution has also doubled, for a fragment shader the number of pixels to process has also quadrupled. But even then the capacity to process vertices and other information has also improved which also needs to be taken into consideration.

So we can say iPad3 has improved performance which will surely elevate the frame rate but it is just a theoretical speculation based on the information above.

This is just a glimpse and has a lot of things to cover in order to provide even a speculation.

Practically, the things might not be as they are as per the speculation so it is much better if you test them out with different scenarios if you have these devices (I don't :( )