title: What the energy impact depends on? How can I improve that? (Xcode 8, Swift 3, SpriteKit)
body: <p><a href="https://i.stack.imgur.com/DVU93.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/DVU93.png" alt="enter image description here"></a></p>
  
  <p>I am creating a SpriteKit game with Swift3, and my Xcode8 debug area say me that my game have a very high energy impact. Depends on what? How can I improve it?</p>
  
  <p>Thanks in advance.</p>