Оптимизация видео с ютуба на сайте

.youtube {
            background-position: center;
            background-repeat: no-repeat;
            position: relative;
            display: block;
            overflow: hidden;
            transition: all 200ms ease-out;
            cursor: pointer;
            margin: 40px auto 0 auto;
        }
        
        iframe {
          margin: 40px auto 0 auto;
        }
        
        .youtube .play {
            background: url("data:image/png;base64,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") no-repeat center center;
            background-size: 64px 64px;
            position: absolute;
            height: 100%;
            width: 100%;
            opacity: .8;
            filter: alpha(opacity=80);
            -webkit-transition: all 0.2s ease-out;
            -moz-transition: all 0.2s ease-out;
            -o-transition: all 0.2s ease-out;
            transition: all 0.2s ease-out;
        }
        
        .youtube .play:hover {
            opacity: 1;
            filter: alpha(opacity=100);
        }

"use strict";
        function r(f){/in/.test(document.readyState)?setTimeout('r('+f+')',9):f()}
        r(function(){
            if(!document.getElementsByClassName) {
                // IE8 support
                var getElementsByClassName = function(node, classname) {
                    var a = [];
                    var re = new RegExp('(^| )'+classname+'( |$)');
                    var els = node.getElementsByTagName("*");
                    for(var i=0,j=els.length; i<j; i++)
                        if(re.test(els[i].className))a.push(els[i]);
                    return a;
                }
                var videos = getElementsByClassName(document.body,"youtube");
            }
            else {
                var videos = document.getElementsByClassName("youtube");
            }
        
            var nb_videos = videos.length;
            for (var i=0; i<nb_videos; i++) {
                // Based on the YouTube ID, we can easily find the thumbnail image
                videos[i].style.backgroundImage = 'url(http://i.ytimg.com/vi/' + videos[i].id + '/sddefault.jpg)';
        
                // Overlay the Play icon to make it look like a video player
                var play = document.createElement("div");
                play.setAttribute("class","play");
                videos[i].appendChild(play);
        
                videos[i].onclick = function() {
                    // Create an iFrame with autoplay set to true
                    var iframe = document.createElement("iframe");
                    var iframe_url = "https://www.youtube.com/embed/" + this.id + "?autoplay=1&autohide=1";
                    if (this.getAttribute("data-params")) iframe_url+='&'+this.getAttribute("data-params");
                    iframe.setAttribute("src",iframe_url);
                    iframe.setAttribute("frameborder",'0');
        
                    // The height and width of the iFrame should be the same as parent
                    iframe.style.width  = this.style.width;
                    iframe.style.height = this.style.height;
        
                    // Replace the YouTube thumbnail with YouTube Player
                    this.parentNode.replaceChild(iframe, this);
                }
            }
        });