title: Listview's ArrayAdapter notifydatasetchanged() very slow redraw
body: <p>I've a quite simple list with 3 textview fields on each row. We are updating their values every 2 seconds or so with data coming from a background webservice call ( AsyncTask ) </p>
  
  <p>We compare the coming values with the current ones, update them accordingly on the Adapter and finally calling notifyDataSetChanged() if needed</p>
  
  <p>The thing is that the redraw gets really slow thus hanging the whole UI when we got more than 3 update rows at once. Of course we are using all ListView well-known optimizations such as the EfficientAdapter approach ( setTag() and holders ),  and getViewTypecount()/getItemViewType() . We have also tried to optimize our interface as much as possible with layoutopt and trying to avoid wrap_content widths and heights to lighten things up .</p>
  
  <p>We don't do expensive operations on our updates either, just standard stuff: changing TextView text, textcolor, and backgroundcolor values.</p>
  
  <p>The only weird thing I can see is that getView() is called 3-4-5 times for each row, although I've read all those Romain's messages [1] telling that is nothing wrong with that</p>
  
  <p>Any ideas or hints on how can we speed it up?</p>
  
  <p>Thank you very much!</p>
  
  <p>[1] <a href="http://groups.google.com/group/android-developers/browse_thread/thread/4c4aedde22fe4594/aeb04288064f495e?show_docid=aeb04288064f495e" rel="noreferrer">http://groups.google.com/group/android-developers/browse_thread/thread/4c4aedde22fe4594/aeb04288064f495e?show_docid=aeb04288064f495e</a></p>