https://www.dalenematthee.co.za/wp-content/themes/dalene_theme/js/runflex.min.js?ver=20180523

1//https://web-design-weekly.com/snippets/lazy-loading-images-flexslider/
2var $dalene_slider=jQuery.noConflict();
3$dalene_slider(window).load(function() {
4  $dalene_slider('.basicslider').flexslider({
5    touch: true,
6    animation: "slide",
7    slideshow: false,
8    controlNav: true,
9    slideshowSpeed: 7000,
10    animationSpeed: 600,
11    initDelay: 0,
12    start: function(slider) { // Fires when the slider loads the first slide
13      var slide_count = slider.count - 1;
14
15      $dalene_slider(slider)
16        .find('img.lazy:eq(0)')
17        .each(function() {
18          var src = $dalene_slider(this).attr('data-src');
19          $dalene_slider(this).attr('src', src).removeAttr('data-src');
20        });
21    
22        $dalene_slider('.flexslider.basicslider').removeClass('loading');
23        
24    },
25    before: function(slider) { // Fires asynchronously with each slider animation
26      var slides     = slider.slides,
27          index      = slider.animatingTo,
28          $slide     = $dalene_slider(slides[index]),
29          $img       = $dalene_slider.find('img[data-src]'),
30          current    = index,
31          nxt_slide  = current + 1,
32          prev_slide = current - 1;
33
34      $slide
35        .parent()
36        .find('img.lazy:eq(' + current + '), img.lazy:eq(' + prev_slide + '), img.lazy:eq(' + nxt_slide + ')')
37        .each(function() {
38          var src = $dalene_slider(this).attr('data-src');
39          $dalene_slider(this).attr('src', src).removeAttr('data-src');
40        });
41    }
42  });
43});