Hello
The parallax effect is created using the stellar.js script (
http://markdalgleish.com/projects/stellar.js/). Unfortunately it is very hard for us to troubleshoot such local issues as it sounds like a browser resource issue. Maybe try disabling all browser plugins. You can also disable this effect by removing the following from the end of your templates index.php (../templates/j51_chelsea/index.php)....
<!-- Stellar -->
<script type="text/javascript" src="/<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/js/jquery.stellar.js" charset="utf-8"></script>
<script type="text/javascript">
if (Modernizr.touch) {
} else {
jQuery(window).stellar({
horizontalScrolling: false
});
}
</script>
Ciarán