Hướng dẫn tối ưu tốc độ tải trang blogspot nhanh nhất trên PageSpeed Insights

<b:if cond='data:widgets.Blog.first.allBylineItems.comments and data:view.isSingleItem'>
<style>
.theme-button {
    position: relative;
    overflow: hidden;
    display: inline-block;
    min-width: 80px;
    height: 34px;
    line-height: 36px;
    padding: 0 10px;
    color: #fff!important;
    -webkit-appearance: none;
    font-size: 14px;
    letter-spacing: .5px;
    font-weight: 400;
    border: 0;
    text-transform: uppercase;
    text-decoration: none;
    border-radius: 4px;
    transition: opacity .15s;
 background-color: #007bc7;
}
  .calcel-reply{margin-bottom: 25px;}
  .comment-reply:hover{cursor: pointer;}
</style>
<script>//<![CDATA[
$(function() {
  // load script
  $.getScript('https://www.blogger.com/static/v1/jsbin/2567313873-comment_from_post_iframe.js').done(function(){
    BLOG_CMT_createIframe('https://www.blogger.com/rpc_relay.html')
  })
  var l = '',id = '',li = ''
  // Gọi iframe khi click vào nút reply
  $('.comment a.comment-reply').click(function(e) {
    l = $('#comment-editor').attr('src')
    $('.calcel-reply').remove()
    $('.comment-actions').removeAttr('style')
    $('#top-continue.continue').hide()
    var $this = $(this),
    id = $this.attr('data-comment-id')
    l = l + '&parentID=' + id
    li = $this.parent().parent().parent().attr('id')
    $('#comment-editor').attr('src', l)
    $this.parent().hide()
    $('#comment-editor').appendTo($('#' + li + '>.comment-replybox-single'))
    $('#' + li + '>.comment-replybox-single').append('<div class="calcel-reply"><button class="theme-button" type="button">Hủy</button></div>')
    $('.calcel-reply').click(function() {
      $(this).remove()
      $('.comment-actions,#top-continue.continue').removeAttr('style')
      $('#comment-editor').appendTo($('.comment-form'))
    })
  })
  // Gọi iframe khi click vào nút Thêm nhận xét dưới cùng
  $('#top-continue.continue>a.comment-reply').click(function(e) {
    e.preventDefault()
    $(this).parent().hide()
    $('.calcel-reply').remove()
    $('.comment-actions').removeAttr('style')
    $('#comment-editor').appendTo($(this).parent().next())
    $('.comment-replybox-thread').append('<div class="calcel-reply"><button class="theme-button" type="button">Hủy</button></div>')
    $('.calcel-reply').click(function() {
      $(this).remove()
      $('.comment-actions,#top-continue.continue').removeAttr('style')
      $('#comment-editor').appendTo($('.comment-form'))
    })
  })
})
//]]></script>
</b:if>