Why does my iPhone 4 gets very lag and unstable after updated to iOS 5.1?

I have been using iOS 5.0.1 previously without any problem and smooth, however after i updated to iOS 5.1, my phone is getting unstable.
Every time when i unlock my screen, it may lag for a few seconds. This issue does not happened when i'm using iOS 5.0.1. I did restore my phone using iTunes but the issue is still there. Anyone able to help me pls?

Try restarting your iPhone 5 by holding down the on/off and the home buttons at the same time until you see the Apple logo. Then give it a try.

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I misread that the in kernel driver of v3.12 was working properly. THat way you can figure out what exact change broke performance by testing different development kernels.
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Close all open apps by double-tapping the home button, then swiping up and off the screen with the app window (not the smaller icon).
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Why does my iPhone 4 gets very lag and unstable after updated to iOS 5.1?

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