WordPress query posts on scroll laggy/skips - php

Question

I have a website that on the homepage contains images/sliders standard page content etc. Once the page loads, it scrolls nice and smoothly. But I have a section about half way down that queries and displays WordPress Posts (see code below). When I view it in Google Chrome, while scrolling in that section, the website becomes laggy/skips and doesn't smoothy scroll like the rest of the home page.
Is there a way or something to include that will have WordPress query the posts faster or better or is there another reason as to why scrolling in that section becomes laggy?
<?php
$temp = $wp_query;
$wp_query= null;
$wp_query = new WP_Query();
$wp_query->query('no_found_rows=true&showposts=6&post_status=publish' . '&paged='.$paged);
while ($wp_query->have_posts()) : $wp_query->the_post(); ?>
<div class="newspagearticle full">
<div class="newsthumb">
<?php the_post_thumbnail( 'category-thumb' ); ?>
</div>
<div class="homenewsheader">
<div class="newsdate">
<div><?php the_time('M') ?></div>
<?php the_time('d'); ?>
</div>
<h2>
<a class="readmore" href="<?php the_permalink() ?>">
<?php
$thetitle = $post->post_title; /* or you can use get_the_title() */
$getlength = strlen($thetitle);
$thelength = 200;
echo substr($thetitle, 0, $thelength);
if ($getlength > $thelength) echo "...";
?>
</a>
</h2>
</div>
<div style="clear:both;"></div>
<?php the_excerpt(); ?>
</div><!-- /newspagearticle -->
<?php endwhile; ?>
<?php wp_reset_postdata(); ?>