how to root xperia u ?

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http://forum.xda-developers.com – hi every one , السلام عليكم :) i now have ver 4.0.4 android on my xperia u , but i wanna root the phone , to install the applications that need root , so how i do it ? i hope someone help me about it .. :) and i forget ask about something too , when i use wifi , the system become slow !! and i not use many application just google store or just play a game " subway surfers " .. (HowTos)