jQuery slideshow - time lag between image changing and caption changing? beginner needs help

jQuery slideshow - time lag between image changing and caption changing? beginner needs help

Hoping someone can help! Am new to jQuery and have built a slideshow with a caption using the following script. However there is an irritating lag between the time the image changes and the caption changes (ie image changes and then a a second later the caption changes. Can anyone advise how to fix this so that the image and caption change at the same time, with no lag? Thanks in advance!

<script type="text/javascript">
$(function() {
    $('#slideshow').cycle({
        fx:       'fade',
        timeout:   3000,
        after:     function() {
            $('#caption').html(this.alt);
        }
    });
});
</script>