Loading issue on Chrome for my Wordpress theme

I am getting a weird loading issue on my Wordpress theme that happens on Chrome only, I've tested it on Safari and Firefox, the content gets loaded all in once, but if you scroll down the page fast on the Chrome browser, it shows blank areas and loads the remaining content after 1 second, please check it out at http://xscoder.com/wp-demo/vintymag/

Any idea of what's causing that sort of "flickering" issue?

I've also noticed that the sidebar follows the content while scrolling down, which is something I haven't coded in my functions.php file, so I have no idea why it does that...

My index.php file is empty because I've created a page.php file that calls header and footer and hosts all the content of the Home page. And in my page.php file I call a few different queries, like this:

?php get_header() 
/* 
    Template Name: Home - Default
*/
?
?php
   $query_latest_carousel = new WP_Query( array(
      'posts_per_page' = 4,
   )); 
   // the Loop...

then:

    ?php  $query_featured_posts = new WP_Query( array( 'tag' = 'featured' ) );
   // the Loop...

And another one:

 // search for 'featured' tag 
   $tags = wp_get_post_tags($post-ID);
    foreach ( $tags as $tag ) {
      if ($tag-name == 'featured') {
         $tag_id = $tag-term_id;
      }
    }

    // query without 'filtered' tag
   $query_posts = new WP_Query( 
      array(
         'tag__not_in' = array($tag_id),
         'posts_per_page'=-1,
      )
   );
   // the Loop...


!-- Sidebar-- 
aside class="col-md-4 sidebar_right"
?php dynamic_sidebar('right-sidebar'); ?
/aside!-- ./ Sidebar--

?php get_footer(); ?

May this be the issue, too many different queries in the same page? And if that's yes, why does my website work perfectly on Firefox?

Any help will be greatly appreciated, thanks!