If I click the enlarge, I wouldn't mind waiting a bit if the download happens at that point, instead of when the posts are loading up? Not sure if that can help the bandwidth issue, but still give us larger image support? I don't want pages to load slower because we went to larger images though.
Apple doing a 200% digital resizing of images that don't meet some sort of resolution minimum is one of the major causes of why we have so many debates about image quality, IMO. People, when having IQ discussions and comparing results, don't often realize how much their viewing hardware plays a part vs the actual image file itself, or even what the site that serves up the image might be doing to the file under the covers to save space. I think the monitor and the site serving up files (not POTN, but others) are the 2 largest culprits to all the IQ arguments that we get into.