I don't think posting such a big photo would be advisable. Better to put up a pic that most people can view all at one go, without scrolling and panning. A size of roughly 800 x 600 or 900 x 650 might be a good target. There is also the "quality" of save to deal with. Once you have the size you think you want, you can try different quality levels to see how small you can get it without visibly loosing color and detail. I'm by no means even close to an expert but that's what i've figured out so far. I'm sure there are a variety of tricks one can apply to get max quality at a minimum of file size. One of these days I'll get around to learning more about it.
