Contact form 7 render blocking CSS WordPress

1 De-Registering Contact Form 7 CSS File

// Deregister Contact Form 7 styles
add_action( 'wp_print_styles', 'wdo_deregister_cf7_styles', 100 );
function wdo_deregister_cf7_styles() {
    if ( ! is_page( 'contact-us' ) ) {  // with use of WP conditional function load CF7 style only on those page where Form use, contact-us is slug of Contact page
        wp_deregister_style( 'contact-form-7' );
    }
}
// To  De-Register CF7 css for front page

    if ( is_front_page()) {
        wp_deregister_style( 'contact-form-7' );
    }

2 De-Registering Contact Form 7 JS File

// Deregister Contact Form 7 JavaScript files on all pages except Contac Us page
add_action( 'wp_print_scripts', 'wdo_deregister_cf7_javascript', 100 );
function wdo_deregister_cf7_javascript() {
    if ( ! is_page( 'contact-us' ) ) {
        wp_deregister_script( 'contact-form-7' );
    }
}