If you want to use SVG, use inkscape to convert SVG to PNG at a middleish resolution. There is a problem, I think, with some phones especially with limited GPU memory. Some other tools get round this by having multiple resolutions of graphics and loading one which is the best fit post scaling to fit the browser space.
It would probably be better to have realtime 3D rendering of a model without any animation or skeleton work or similar - so just render it from a particular viewpoint. WebGL is designed to do this pretty much.