title: Loading multiple images from the webservice faster
body: <p>I want to load multiple images from the JSON webservice to my app. These images serve as thumbnails to a "Store" in my app. So when the user clicks a button to go to the "Store", a request is being made. And this request is repeated every time the user clicks the button. </p>
  
  <p>Now there is no problem here, but the problem arises when the data in JSON multiplies in quantity. Before, we are loading only 5 images. Now, we are loading at least 18 images. These could pose a real problem when the images multiplied to 100 or more. </p>
  
  <p>I am contemplating in using <code>NSURLCache</code> to cache the images, but how will I know if there is an update to the images? Say a new image is added, or the current image is no longer being used? Can anyone give me any ideas on what is the best way to approach this?</p>