Performance issue on iPad4 with AIR SDK 3.9

Hi!
I have an app that I've created with Flex SDK 4.6.0. The first time I've compiled the app with AIR SDK 3.1 and it runs with good performance on iPad4 (and little bit slow on oPad2). Then I've upgrated the AIR SDK to the version 3.9 and suddenly my app starts to run slow (but on iPad2 performance is good)
Is it any known problem with AIR SDK 3.9 on iPad4? Or on iOS 6.1?
Should I downgrade the AIR SDK back to 3.1 to get good performance on iPad4?
Thanks in advance
UPD: I've downgraded the AIR SDK to 3.1 and my app get back the good performance! (But there's some strange bugs)
Message was edited by: yx

Hi Nimit!
1. I've upgraded AIR SDK to 4.0 beta and the problem is gone away.
2. Unfortunately I'm not sure I can share my app - it's not in the policy of the company I'm working for. I'll check it out with my boss
Than you,
Olga

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