In Photoshop, go to File > Save for Web. Then, select JPG and set the compression to 85- this is good balance between quality and file size. Users won't see the extra quality beyond a setting of 85, but lower settings (which reduce file size) become very visible. And keep in mind that an image counts a "view" as soon as the page loads... even if you don't wait around for the image itself to load. --John

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