title: Using low GPU priority for background rendering
body: <p>How to debug <em>"Using low GPU priority for background rendering."</em></p>
  
  <p>I see on console of an app using <code>AVFoundation</code> on iOS8 beta4?</p>
  
  <p>I suppose I'm doing some unneeded work that I could skip saving the battery
  and eliminating the message I've tripped</p>