title: Application sending JSON on demand, not on creation (Ext-JS 4)
body: <p><img src="https://i.stack.imgur.com/idw5X.jpg" alt="enter image description here"></p>
  
  <p>When I start my application, my computer loads it 15 seconds. It loads a whole bunch of grids and things that I want to load dynamically.</p>
  
  <p>What do I have to do if I want for those grids to be loaded "on demand"? Do I have to load controllers dynamically or just the grids? And how?</p>
  
  <p>Thank you. :)</p>