How to Disable EMOJIS in WordPress?

They are smileys used on the Internet. If you don’t use it, Emojis script (wp-emoji-release.min.js) in WordPress creates an extra request, which adds to total page load time, and slows down your WordPress site. Professional website never use it.

For more info https://wordpress.org/support/article/emoji/

There are two ways.

1. Custom code in function.php

add_action( 'init', 'ec_emoji_scripts' );
function ec_emoji_scripts() {
	remove_action( 'wp_head', 'print_emoji_detection_script', 7 );
	remove_action( 'admin_print_scripts', 'print_emoji_detection_script' );
	remove_action( 'wp_print_styles', 'print_emoji_styles' );
	remove_action( 'admin_print_styles', 'print_emoji_styles' ); 
	remove_filter( 'the_content_feed', 'wp_staticize_emoji' );
	remove_filter( 'comment_text_rss', 'wp_staticize_emoji' ); 
	remove_filter( 'wp_mail', 'wp_staticize_emoji_for_email' );
	
	add_filter('tiny_mce_plugins', function ($plugins) {
		if (is_array($plugins)) {
			return array_diff($plugins, array('wpemoji'));
		} else {
			return array();
		}
	});

	add_filter('wp_resource_hints', function ($urls, $relation_type) {
		if ('dns-prefetch' === $relation_type) {							
			$emoji_svg_url = apply_filters('emoji_svg_url', 'https://s.w.org/images/core/emoji/2/svg/');

			$urls = array_diff($urls, array($emoji_svg_url));
		}

		return $urls;
	}, 10, 2);
}

2. Using EC Addons