Microsoft FrontPage - Resizing FrontPage Images Doesn't Reduce Their File Size (98/2000/2002/2003)
Many novice FrontPage users assume that resizing an image (by dragging one of its size handles) reduces the image's file size--which determines how quickly the image will load in the browser. In reality, though, resizing has no effect on its file size.
Once you've resized an image by dragging one of its size handles, you must then resample it by clicking the Resample button on the Pictures toolbar. Doing so not only reduces the file size but generally improves the image's appearance significantly.