title: UI of react native app (on iOS) lags and fps rate drops regularly
body: <p>The UI of my react native app drops regularly but only on iOS. I attached a screenshot which shows the UI fps of about 11. Also it's a very steady wave and keeps happening several times. This leads to a annoying lags like for example during transitions, animations or during countdowns like on the screen attached.
  Any experiences with similar problems or ideas how to solve it or what's the reason for this?</p>
  
  <p>Also important to mention, that it both happens on iOS simulator and real devices. Android doesn't have these problems.</p>
  
  <p><a href="https://i.stack.imgur.com/Bs9Ki.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Bs9Ki.png" alt="enter image description here"></a></p>