I don’t think they are GPU backed. Fonts are rendered with CPU and draw really slow. The same with graphics primitives like lines, ellipses. A QML scene graph s

I don’t think they are GPU backed. Fonts are rendered with CPU and draw really slow. The same with graphics primitives like lines, ellipses. A QML scene graph supports only text, images, and rectangles and the text is CPU rendered. Windows still mainly uses CPU for graphics. Video with changing text overlays is a difficult problem to do efficiently.