It's not a "3D engine", it's basic line and shape drawing. With SVG, you will easily run into the same performance issues with any kind of dynamic content, 3D

It's not a "3D engine", it's basic line and shape drawing. With SVG, you will easily run into the same performance issues with any kind of dynamic content, 3D or not. With Canvas, you may or may not run into them, depending on how much content you have. In either case, performance is terrible compared to what you can do in a native application.