Pagespeed – Does not use passive listeners

Hi,
Please see this StackOverflow thread it seems this is a known limitation since 2016 that jQuery can’t add support to passive listeners.
I tested the solution it recommends:

jQuery.event.special.touchstart = {
    setup: function( _, ns, handle ) {
        this.addEventListener("touchstart", handle, { passive: !ns.includes("noPreventDefault") });
    }
};
jQuery.event.special.touchmove = {
    setup: function( _, ns, handle ) {
        this.addEventListener("touchmove", handle, { passive: !ns.includes("noPreventDefault") });
    }
};
jQuery.event.special.wheel = {
    setup: function( _, ns, handle ){
        this.addEventListener("wheel", handle, { passive: true });
    }
};
jQuery.event.special.mousewheel = {
    setup: function( _, ns, handle ){
        this.addEventListener("mousewheel", handle, { passive: true });
    }
};

as a WPCode Code Snippet:

and it passed the Pagespeed report:

Please give this a try.

Best regards,
Mike

Hi,
I used the WPCode Code Snippet plugin, if you are using a child theme you could wrap it in a function and add it to your child theme functions.php, but not your parent theme functions.php otherwise you will lose it on your next update.
In a child theme functions.php you would add this:

function support_for_passive_listeners() { ?>
    <script>
window.addEventListener('DOMContentLoaded', function() {
jQuery.event.special.touchstart = {
    setup: function( _, ns, handle ) {
        this.addEventListener("touchstart", handle, { passive: !ns.includes("noPreventDefault") });
    }
};
jQuery.event.special.touchmove = {
    setup: function( _, ns, handle ) {
        this.addEventListener("touchmove", handle, { passive: !ns.includes("noPreventDefault") });
    }
};
jQuery.event.special.wheel = {
    setup: function( _, ns, handle ){
        this.addEventListener("wheel", handle, { passive: true });
    }
};
jQuery.event.special.mousewheel = {
    setup: function( _, ns, handle ){
        this.addEventListener("mousewheel", handle, { passive: true });
    }
};
});
</script>
  <?php
}
add_action('wp_footer', 'support_for_passive_listeners');

I tested this and it passed the Pagespeed report.

Best regards,
Mike

Hi,
Glad we were able to help, I will refer this thread to the Dev Team for their review. If you have any further questions please create a new thread and we will gladly try to help you. Thank you for using Enfold.

Best regards,
Mike