Just got this update now and was also wondering what it does. All I can tell so far is it *dramatically* improved screen response time for me. In other words, when I move left or right on the home screens tracking is instant, like on the iPhone. It used to respond like it did on my S3, with a slight follow behind your finger. Never been a problem really but I've always envied how fast the iPhone tracks movements. I've also noticed in my S5 typing in my unlock code really blaze fast sometimes took more than one try, never had that issue on my S3. But now it unlocks perfectly when I type fast. Seems it improved the lag some were reporting?