When data is being delivered to web applications the chances are that you'll be displaying that data within the user interface (UI). In order to do this you need to find the element in the Document Object Model (DOM) and then update it. Whilst the performance of web browsers is improving all the time DOM manipulation can still be costly (use up time and resources) if you are pushing through a lot of data so it's worth keeping the interaction with the DOM to a minimum. You should also consider...
