Help!! Lag after screen unlock

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http://forum.xda-developers.com – Hi! I have a big problem (at least for me is a big one). I am a butter-smooth UI addict, and i have a problem on my I9001. Every rom i flash, even stock, my phone lags after unlocking the screen.So. I unlock the phone via lockscreen, and my fps drops below 20. I swipe left-right for about 3 times and the phone works perfect. I don't now what to do.Please help, and sorry for my bad english :P Sent from my GT-I9001 using xda premium (HowTos)