We considered libjpeg-turbo, but the performance of jpegtran there is much unchanged. If you look at the Huffman encoding function it is exactly the same. Apply

We considered libjpeg-turbo, but the performance of jpegtran there is much unchanged. If you look at the Huffman encoding function it is exactly the same. Applying the optimizations to libjpeg-turbo also yield a 2x performance improvement for our usage.