title: Make Binding/IValueConverter lower priority
body: <p>I am displaying list of files and everything relies on Bindings and IValueConverters. The problem is that icons generate slowly as also some data like MP3's ID3 tags which I extract with IValueConverter supplying it with a path to song. </p>
  
  <p>Since I use Virtualization experience is horrible: on scroll files update one by one, and I would prefer ID3 tags to populate after all other IValueConverter have finished updating.</p>
  
  <p>Is that possible? </p>