> I also believe that the graphic card can achieve more parallelisation and therefore handle much bigger JPG images Very large images are fairly rare on the we

> I also believe that the graphic card can achieve more parallelisation and therefore handle much bigger JPG images Very large images are fairly rare on the web. In particular phones don't have giant displays, so it's usually a waste of bandwidth to send a huge picture to a phone as part of a webpage. And, speaking only for mobile Firefox at the time I worked on it, we had lots of bigger problems with large images than decoding speed. For example, Firefox would keep the whole decoded image in memory while it was onscreen, even if it was only displaying only part of the image or only a downsampled version of the image. If it's a giant image, the decoded image could use up a large fraction of the device's memory. I'm also not aware of any major phones with have GPGPUs -- I'm not an expert in this stuff, but I think you'd need that to get any serious acceleration from JPEG decoding.