Reply To: Referenced thumbnail file size is much larger than the actual thumbnails

Well, you can try to force the background size to be initial (original resolution), instead of trying to cover the space:

div.asp_r.asp_r.horizontal .results .item .asp_image {
    background-size: unset !important;
}

This custom CSS will prevent the image processing by the browser, and print the image as it is, in the original native resolution (440×330 in your case). That should remove the browser render blur as well.