Force GPU will do little in terms of real world performance on your phone. Changing the animation speeds to .5 will make the phone FEEL snappier, as it makes the windows pop in and out faster.
On a stock ROM there aren't many good uses. On custom firmware you can set reboot list options, ART, and a couple others, but really its not useful for the every day user.
Last edited by zero0422; 8th January 2014 at 02:50 AM.