Je note ça pour ne charger les scripts q'en cas de besoin...

// Optimisation de Contact Form 7
 add_action( 'wp_print_scripts' , 'cf7_js' , 100 );
function cf7_js() {
if ( !is_page('contact')) {
wp_deregister_script( 'contact-form-7' );
}
}
add_action ( 'wp_print_styles' , 'cf7_styles' , 100 );
function cf7_styles() {
wp_deregister_style( 'contact-form-7');
wp_register_style( 'contact7' , get_template_directory_uri() . '/css/contact.css' );
wp_enqueue_style( 'contact7', get_template_directory_uri() . '/css/contact.css' );  
}