[Q] why is the tablet so laggy

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http://forum.xda-developers.com – Its realy laggy in 3d games on 2.3 was great but sinds 4.0 my tablet lagg noting is smooth.... But when i restart tablet it works great for 30min No lag and then i let it a little and voila gta3 lags even internet or worms.... Ow ad every browser closes it self dolphin chrome opera just browsing and then click and gone no FC just back to home screen.... Can any one explain why? Or what i sould do? Have rohan tweaks.... And now downloading lastest nightly and maybe titanuim backup all and do factory reset and update? Hope it will work donr think soo:'( But is mostly the browser tha (HowTos)