Why my game has a bad frame drop in android!

Hi ! not just my game ! even a simple animation that I created has a frame drop!
it’s very bad ! in unity editor it’s OK! but in the android phones no!
there is no any special in profile and v sync is disable !
i’m really confused! what should I do!
Note: when I select Auto rotation I see in protrait! bad frame drop!
but in landscape it’s OK!!!
my game is protrait! I use unity 5.5.1!
please HELP ME!..

in portrait is bad!
in landscape is good! very strange
i’m confused