Adding Web Graphics - Tips for Web Images:
"Web images are an important part of your web pages. In order to make sure they don't cause your pages more problems there are a few rules of thumb you should be aware of.Keep Your Images Small
Small images download faster, and the faster your page downloads the more likely people will stay. A good maximum size for images is 10K. Plus, search engines prefer sites that load quickly, so keeping your images small is the first step to making them faster.
Some ways to keep images small: "