Methods, program products, and systems of chunking data records are described. In general, in one aspect, a mobile device can provide for display on a display screen a scrollable window. The scrollable window can display first display content (e.g., a first segment of formatted data) stored in a first display buffer. The mobile device can determine that the scrollable window will cross a boundary of the first display buffer. Upon the determining, the mobile device can create second display content (e.g., a second segment of formatted data) in a second display buffer. The second display content can include display content that borders the first display content at the boundary. The mobile device can provide for display the second display content when the scrollable window crosses the boundary.