PSI Optimization

defer-comment-reply.php

<?php

function wp_dereg_script_comment_reply(){
	wp_deregister_script( 'comment-reply' );
}
add_action('init','wp_dereg_script_comment_reply');

add_action('wp_head', 'wp_reload_script_comment_reply');
function wp_reload_script_comment_reply() {
	?>
	<script>
		//Function checks if a given script is already loaded
		function isScriptLoaded(src){
			return document.querySelector('script[src="' + src + '"]') ? true : false;
		}
		//When a reply link is clicked, check if reply-script is loaded. If not, load it and emulate the click
		var repLinks = document.getElementsByClassName("comment-reply-link");
		for (var i=0; i < repLinks.length; i++) {
			repLinks[i].onclick = function() { 
				if(!(isScriptLoaded("/wp-includes/js/comment-reply.min.js"))){
					var script = document.createElement('script');
					script.src = "/wp-includes/js/comment-reply.min.js";
					script.onload = emRepClick(event.target.getAttribute('data-commentid'));        
					document.head.appendChild(script);
				}
			}
		};
		//Function waits 50 ms before it emulates a click on the relevant reply link now that the reply script is loaded
		function emRepClick(comId) {
			sleep(50).then(() => {
				document.querySelectorAll('[data-commentid="'+comId+'"]')[0].dispatchEvent(new Event('click'));
			});
		}
		//Function does nothing, for a given amount of time
		function sleep (time) {
			return new Promise((resolve) => setTimeout(resolve, time));
		}
	</script>
	<?php
}

dequeue-unused-jetpack-css.php

<?php

add_filter( 'jetpack_implode_frontend_css', '__return_false' );