Sticky Header Delay

Hi there,

I managed to get the sticky header working with the following code:
<script type=”text/javascript”>
var stm_sticky = ‘<?php echo esc_js( stm_hb_get_option( ‘header_sticky’, ”, $hb ) ); ?>’;
</script>

However there’s a bit of a scroll down delay in which it is possible for no header to appear. I was wondering if I can remove or shorten this?