The article mentions synchronous performance, but there are no mentions of optimizations. You can do a lot of optimizations in JavaScript and the VM itself is a

The article mentions synchronous performance, but there are no mentions of optimizations. You can do a lot of optimizations in JavaScript and the VM itself is already well optimized. If your naive implementation is slow, my experience says you can speed it up 100x. Then it's not really worth switching to C/C++ assembly for another 10x performance. Then it's better to take the step to pure hardware.