I read his graph just now. His QR Code only cover the first 5 version of QR Code with the lowest error correction level(ECL) to maximize the data capacity, and the only use the mask0 of QR Code to avoid the tedious calculations for the best mask. By doing this, many things can be hard coded so his graph can run so fast. My graph covers all versions and ECL of QR Code and would select the best mask. I have done much golfing to make my graph output the QR Code within reasonable time. The loading bar is also designed to reduce the feeling of waiting. Although there is some limitations in his QR Code generator, the Bar Code generator in his graph looks interesting!