Boot to the recovery mode -> wipe cache partition
after reboot press *#0228# and press quick start
after this your screen will go black, press power button or double tab and press back/press multitasking tab and clear all app..
you will get slight performance boost along with calibrated battery.
If you not familiar with recovery mode, then don't do this tips.
Be advised not every Samsung phone has same way to boot to the recovery mode.