The jquery cycle2 plugin allows progressive loading:
http://jquery.malsup.com/cycle2/demo/progressive.php
<div class="cycle-slideshow auto"
data-cycle-fx="scrollHorz"
data-cycle-timeout="2000"
data-cycle-caption=".caption1"
data-cycle-caption-template="{{slideNum}} / 9"
data-cycle-loader="true"
data-cycle-progressive="#images"
>
<img src="http://jquery.malsup.com/cycle2/images/beach1.jpg">
<script id="images" type="text/cycle">
[
"<img src='http://jquery.malsup.com/cycle2/images/beach2.jpg'>",
"<img src='http://jquery.malsup.com/cycle2/images/beach3.jpg'>",
...
"<img src='http://jquery.malsup.com/cycle2/images/beach9.jpg'>"
]
</script>
</div>
<div class="center caption1"></div>
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