When you have a lot of data to display in a Control such as a ListView, you need some way of virtualizing the Nodes created and used. For example, if you have 10 million data items, you don’t want to create 10 million Nodes. So you create enough Nodes to fill the display dynamically. Because of our heritage in Swing, we know how critical this is for real apps. I got an optimization issue reported this morning on “UI Virtualization”. (more…)