load image asynchronous

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The way to async load (lazy load) the content is to not set the ‘src’ attribute and then execute a script that loads the images once DOM-ready is launched. 

 <img data-lazysrc="http://www.amazingjokes.com/images/20140902-amazingjokes-title.png"/>

and with jQuery (or possible with plain JavaScript too) use below code (as suggested here):

<script>  
function ReLoadImages(){
    $('img[data-lazysrc]').each( function(){
        //* set the img src from data-src
        $( this ).attr( 'src', $( this ).attr( 'data-lazysrc' ) );
        }
    );
}

document.addEventListener('readystatechange', event => {
    if (event.target.readyState === "interactive") {  //or at "complete" if you want it to execute in the most last state of window.
        ReLoadImages();
    }
});
</script>

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