title: Deciphering instruments readout
body: <p>CPU usage at ~50% / energy usage "Very high" in my sprite kit game.</p>
  
  <p>I use tile sets to setup the levels. After the tile sets are in place I use clear, non-dynamic sprites with collision/contact bit masks for floors/walls/etc. I get a constant 60FPS, and my memory usage is only ~32MBs.</p>
  
  <p>For animations as of now I have:</p>
  
  <ul>
  <li><p>3 roving (forever) enemies which are not removed from the scene unless stepped on and killed</p></li>
  <li><p>9 vertically moving platforms (up and down forever). Each platform uses an SKaction from game scene.sks and each also moves at different speeds / distances. These aren't ever removed from the scene.</p></li>
  </ul>
  
  <p>I suspect my issue is related to the platforms, but I'm not sure since I'm having trouble deciphering the instruments readout from the CPU. Here is a screenshot of the readout at the point I think the issue is:</p>
  
  <p><a href="https://i.stack.imgur.com/pTfRP.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/pTfRP.png" alt="Instruments screenshot"></a> </p>