¿Plugin alternativo para posts relacionados liviano?

<div class="similarposts"><?php
	$categories = get_the_category($post->ID);
	if ($categories) {
		$category_ids = array();
		foreach($categories as $individual_category) $category_ids[] = $individual_category->term_id;
			$args=array(
				'category__in' => $category_ids,
				'post__not_in' => array($post->ID),
				'showposts'=>5,
				'orderby' => rand,
				'caller_get_posts'=>1
			);

			$my_query = new wp_query( $args );
			if( $my_query->have_posts() ) {
				echo '<ul>';
				while( $my_query->have_posts() ) {
					++$counter;
					if($counter == 4) {
						$postclass = 'last';
						$counter = 0;
					} else { $postclass = ''; }
					$my_query->the_post();
?>
					<li>
						<a rel="nofollow" class="relatedthumb" href="<?php the_permalink()?>" rel="bookmark" title="<?php the_title(); ?>"><?php the_title(); ?></a>
					</li>
<?php
				}
				echo '</ul>';
			}
		}
		wp_reset_query();
?></div>

.similarposts { margin:0px; padding:0px; float:left; }

.similarposts ul { margin:0 0 0 15px; padding:0px; list-style:none;  float:left; }

.similarposts ul li { margin:0 20px 0 0; padding:3px 0 5px 4px; font-size:13px; list-style:none; display:block; }

.similarposts ul li a { line-height:15px; font-weight:bold; }
.similarposts ul li a:hover { text-decoration:none; }