Abstract: One or more techniques and/or systems are disclosed for virtualizing data in a user interface (UI). A virtual layout viewport is identified which comprises an area that may be viewed in a UI, where at least some data from one or more tuples of data is to be realized in the viewable area of the UI. Data that is to be realized in the viewport is identified from the one or more tuples of data, and the identified data is realized in the viewport, such as by creating a representation of the data for display in the UI. The realized data can be virtualized by removing the representation when the virtual layout viewport is modified in relation to a display of tuple data (e.g., an item is scrolled out of view).