In your demo, how are the images chosen for each image and algorithm combination? I mean how do you choose the compression level for each, to keep the comparison fair? I would hope you have a budget in KB and go as high quality as you can without going over that KB limit.
Not my demo, it's from someone at Mozilla, but, yes, the usual practice for comparisons is to match the size of the compressed content. I don't have context for that page, so I can't actually cite anything here.
