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// Hack Contact Form 7 to avoid unwanted ajax calls
// see http://stackoverflow.com/questions/19632244/is-w3-total-cache-compatible-with-contact-form-7
add_action('wpcf7_enqueue_scripts', 'hack_cf7');
function hack_cf7() {
    $_wpcf7 = array(
        'loaderUrl' => wpcf7_ajax_loader(),
        'sending' => __( 'Sending ...', 'contact-form-7' ) 
    );
    wp_localize_script( 'contact-form-7', '_wpcf7', $_wpcf7 );
}