Dynamic shadows decrease performance in android.

I tested the sample assets project on my mid-range Motorola (adreno 306), and the game ran with a very low frame rate, although it ran very smoothly on my friend’s device (Snapdragon 625, adreno 506)
No matter how many objects are present in the scene, as soon as i turn on realtime shadows for the directional light, fps drops to 6-10.

ps :
api - opengl es 2.0

android 6.0.1

unity 2017.1

vsync off,
shadow quality - medium (changing this doesn’t do anything)
shadow Cascades - 0
shadow distance - 50

Try not to use those shadows if possible. Test Unity’s Post Processing Stack (PFX), see if it helps.