Unity Profiler: Device.Present and FPS Drop Problems

I made days of research about this Device.Present problem. This is a weird one really, it is around for 10 years, I found post from 2010 and 2017 people still having same problem, and this need to be solved.

TEST ENVIRONMENT:
Unity: 5.6.3p3 build
Devices: iPhone 5, iPhone 6s, iPad 2017 (9 inch) ,Samsung Tab S2 ( SM-T713 ), Samsung Galaxy S2, Samsung Galaxy S4 Mini
Game: A Racing game
Quality settings: Minimized, Vsync of, targetframe = 60

PROBLEM:...

Unity Profiler: Device.Present and FPS Drop Problems