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Jim Robinson has always said to add the width and height because the thread will load up faster.

This seems incorrect to me. My understanding is that specifying the height and width affects the display size, but not the download size. That is, if one specifies a smaller height and width, then each of us viewing that thread will still have to download to our PC's the same, big, old, fat image file, but then it will display in our web browser shrunk down a bit.

The only way I know to speed up handling of large images is to first convert them to a small image using some image processing program on your own PC, then uploading the shrunken image file to a web site, and setting your <img src=URL> to that uploaded, smaller, image file.

One other detail -- I would specify only one of height or width, not both, in most cases. If you specify both, and don't get their ratio the same as the height-width ratio of the original image, then you will force the displayed image to be stretched in one dimension or the other. Better to just display one of the two, height or width, and let the other default to whatever is needed to preserve the proportions of the original image.

"This seems incorrect to me."

Well, I would think Jim Rob knows what he is talking about. I specifically asked him and he said height and width are good. I think mostly for those who have dial up. It makes it load up a lot faster.

You can find the height and width when you look at the properties. There are two numbers there next to Dimensions. The width is the first number and the height is the second number.