[ramesh_umk3]

Use below code supports almost all vbulletin 3.x.x , 4.x.x

Add the code in headinclude Template

<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
    <script type="text/javascript" src="http://www.megawrz.com/clientscript/jquery.lazyload.js?v=3"></script>
    <script type="text/javascript">
      $(function(){
        $('img[original-src]').lazyload({threshold: 100});
      });
    </script>
<noscript>
      <style>
        img[original-src]{display: none;}
      </style>
    </noscript>

TESTED Almost 100 HD Mobile Images Loads less than 3 sec in 512kb internet speed
DEMO HERE