title: What are the implications of Image.cache?
body: <p>The <code>Image</code> Qt Quick component has a <code>cache</code> property. The documentation on that property, however, is very scant. In particular, it does not say what the cache is used for, and when images are loaded from the cache.</p>
  
  <p><strong>Can you tell me the implications of setting <code>Image.cache</code> to either true or false?</strong></p>
  
  <p>I'm asking because I'm tempted to save a lot of memory by setting <code>cache: false</code> on all my Images.</p>
  
  <p>The docs do say this:</p>
  
  <blockquote>
    <p>Images are cached and shared internally, so if several Image items have the same source, only one copy of the image will be loaded.</p>
  </blockquote>
  
  <p>But does this mean that <code>cache: true</code> only has a point when several Image items have the same source? And does it mean that <code>cache: false</code> results in no gain whatsoever?</p>
  
  <p><strong>Note:</strong> In my tests with ~1000 images mem usage dropped from 247MB to 237MB when I disabled cache. And this app has a lot of other things in it too. So I'm happy with this win. But my questions stand.</p>