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In responsive design images are typically set to width 100% so that they fill their container where as yslow expects the image dimensions to be specified to meet the image.
Image should be appropriate for their viewport size (obviously we want to avoid very large images being scaled down in the browser) but some allowance should be made for scaling images i.e. if an image is designed for a 320px wide viewport and it's scaled down when it's used in a 300px wide viewport.