i have read and followed some of the advise here and other forums but seems could not find a good answer. . I did: 1. phone restart (will be ok but after x days,, lagging will start to occur again) 2. turned off the animation in developer options 3. minimal apps running.. 4. no over loading apps (as per GSAM and wakelock detector) d 5. S voice via home button disabled already. . . 6. phone not rooted btw. . 7. an app or icon would take atleast 1 second before it respond. ..