Samsung Galaxy Grand Running Slowly After Upgrading to Android 4.2.2 I am using a Samsung Galaxy Grand for 8 months now, which was originally running Android 4.1.2 Jelly Bean. Recently I got a Firmware Update and upgraded my mobile to Android 4.2.2. After this update, my mobile is running slow, and even RAM usage is too high.

Please help me how to solve this Issue.
I'm thinking a factory reset could do the trick for you. Make sure do backup your things with something like Titanium Backup.