Lagging in those places is very common, but theres not much to help there. It seems though it happens no matter what. You can upgrade your device as i did. I upgraded to an iphone 5s and it works almost flawlessly in those situations, but frame rate will still drop. But upgrading is not possible for many people. I still need to test the restore which i will soon do on my ipod 4g. Until then just turn off your device every day, clear history and follow instructions in the guide
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