iPad: 4.3.5
iPad2: 4.3.3

I am seeing that my iPad2 is running my Corona SDK built game app (635) slower than my iPad is; counter-intuitive, right? But it's true. There appears to be audio disparity but I think iPad2 has had some outstanding audio idiosyncrasies for a little while... but I've not heard anyone talk about performance. So I'm going to throw this out there and see if anyone has made a similar observation.

I am reluctant to test / upgrade to iOS 5 because audio appears to get worse on iPad2 at iOS 5 but the speed is a bigger concern I have right now.

Have you experienced this? Do you think it's the opposite?
NOTE: Please take note of my Versions on each device listed above.