10K bytes should be the largest graphics file on your page. Done this way, the user can see the text on your page and read your message while the graphics files are loading. This means little, if any, waiting. Decreasing the amount of graphics you have that are not necessary for the presentation. This is frequently overlooked.
Most people have a default of four socket connections in their Internet web browser.
If you have four sockets, you can download four files at the same time. Thus, if you have ten eleven images on your page, then the browser will download the first four, and then when the first four are completely downloaded, it will start downloading the second set of four. This process continues until all 11 images, plus the page itself, are downloaded. As you can imagine, this is very slow.