Move JS to wp_footer From http://www.kevinleary.net/move-javascript-bottom-wordpress/

functions.php

<?php
/**
 * Load Enqueued Scripts in the Footer
 *
 * Automatically move JavaScript code to page footer, speeding up page loading time.
 */
function footer_enqueue_scripts() {
   remove_action('wp_head', 'wp_print_scripts');
    remove_action('wp_head', 'wp_print_head_scripts', 9);
    remove_action('wp_head', 'wp_enqueue_scripts', 1);
    add_action('wp_footer', 'wp_print_scripts', 5);
    add_action('wp_footer', 'wp_enqueue_scripts', 5);
    add_action('wp_footer', 'wp_print_head_scripts', 5);
}
add_action('after_setup_theme', 'footer_enqueue_scripts');