I have this xiomi redmi note 4 with 64 gb rom and 4gb ram . and its performance is smooth like butter and good optimization. It consists of a security app which is powered by avast my favourite antivirus in android and pc both platforms. This smartphone has a high end features like
1.swiping with three fingers from up to down of screen to take screen shots.
2.inbuilt app lock.and hiding the private photos in gallery by swiping down in albums section in gallery you can see your hide pictures.
3.the camera ball in camera swipe the photo taking button to upwards and you will see one photo capturing camera ball will appear on screen this feature is good and while you have to take picture but you finger can’t touch the capture button so this feature will help you.
Mobile is very good and design is also attractive.
Thanks