jquery - Scrolling Causes Stuttering In Responsive Slider -

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i've been working on fun solution create full page image slider that's responsive viewers browser, , once browser scrolls allows user see content below.

i used bit of jquery , thought had found solution worked perfectly! until got end of project , tried scroll , down. noticed when scroll , down framerate seems bit choppy. doing research people saying may because of ".animate" in jquery. goal here avoid plug-ins , wondering if 1 offer me helpful solution? i'm new jquery , web development in general i've created code pen project may able fork , me out.

here jquery:

   function slideswitch() {     var $active = $('.image.active');      if ( $active.length === 0 ) $active = $('.image:last');      var $next =  $active.next().length ? $active.next()         : $('.image:first');      $active.addclass('last-active');      $next.css({opacity: 0})         .addclass('active')         .animate({opacity: 1}, 600, function() {             $active.removeclass('active last-active');         }); }      $(function() {         setinterval( "slideswitch()", 6000 );     });

there quite abit of css project, may more helpful if post code pen here: http://codepen.io/develonaut/pen/rjvsn

thank help!


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