This isn't manipulating the pixels directly. Javascript is still way too slow to do that, and I don't think that will ever change. The real work is done by the

This isn't manipulating the pixels directly. Javascript is still way too slow to do that, and I don't think that will ever change. The real work is done by the graphics card. The Javascript only uploads a frame to the graphics card, makes it run a shader and then displays the adapted frame.