title: Initializing 'MobileAds.initialize' on frequently visited home activity?
body: <p>Note: I've seen this: 'What is the proper way to call MobileAds.initialize()?' but am asking a different question.</p>
  
  <p>I'm implementing AdMob inside of my application, and I see per Google's notes to add '<code>MobileAds.initialize(this, "app id");</code>' once for faster ad performance. I put this call inside of my <code>onCreate</code> method of the first activity that is displayed, but I am wondering if there are any issues with doing this as per usage of the app, the user may navigate back to this activity multiple times and '<code>MobileAds.initialize(...)</code>' will keep being initialised over and over.</p>
  
  <p>Is this still okay, or can any issues be expected? Or would it be better to implement a splash screen on start in which this is done? Or could it be even better to not even use initialize?</p>