laggy jellybean 4.1.2

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http://forum.xda-developers.com – hi,i've always been a fan of the optimus 4x hd and finally bought one a week ago. was too excited to update to jellybean that i ignored all the problems i heard about and now i can't live with the problems in this update. i could've lived with anything but this lag is too much to take in. i mean,it's a quad core beast for crying out loud! what is the best way to fix this? should i go back to ICS? should i root and install a custom rom?? any help anyone can give me will be greatly appreciated. (HowTos)