From the Qt Docu: http://doc.qt.io/qt-5/qml-qtquick-item.html#antialiasing-prop
antialiasing : bool
Used by visual elements to decide if the item should use antialiasing or not. In some cases items with antialiasing require more memory and are potentially slower to render (see Antialiasing for more details).
The default is false, but may be overridden by derived elements.