Ajax.php high load

<strong>Pid	Owner	Priority	CPU %	Memory %	</strong>
beta	0	  35.0	  1.1	/usr/bin/php ******public_html/*****/wp-admin/admin-ajax.php

Load Averages: 13.56 8.52 5.02

My ajax.php is making a lot of cpu usage can anybody tell me how to avoid this

This is my site https://www.flippish.com

Plugins are

Akismet
Contact Form 7
EWWW Image Optimizer
Nextend Facebook Connect

Simple Lightbox
Simple Local Avatars
Theme My Login
WP-PostViews
WP Super Cache

This shows this
<?php echo $wpdb->num_queries; ?> <?php _e('queries'); ?>. <?php timer_stop(1); ?> <?php _e('seconds'); ?>

66 queries. 0.597 seconds