Which one is faster:orelement.style.transform = window.getComputedStyle(element).transformMatrix.rotateBy(45); // 1 temporary object. all calculations on c++ side... make sure some js library is loadedelement.style.transform = new MyMatrix(window.getComputedStyle(element).transform).rotateBy(45).getFloatArray(); // 2 (or 3) temporary objects + 6 or 16 (12 or 32?) temporary floats + all calculations on js side