You can increase your WordPress Site speed by removing extra information from wp head that you may not need.

remove-extra-junk-from-wp-head.php

<?php

/**
 * It removes unnecessary actions and filters to clean up the WP head to speed up
 */
function prefix_clean_wp_head() {
	// https://scotch.io/tutorials/removing-wordpress-header-junk
	remove_action( 'wp_head', 'rsd_link' );
	remove_action( 'wp_head', 'wp_generator' );
	remove_action( 'wp_head', 'feed_links', 2 );
	remove_action( 'wp_head', 'feed_links_extra', 3 );
	remove_action( 'wp_head', 'wlwmanifest_link' );
	remove_action( 'wp_head', 'adjacent_posts_rel_link', 10, 0 );
	remove_action( 'wp_head', 'adjacent_posts_rel_link_wp_head', 10, 0 );
	remove_action( 'wp_head', 'wp_shortlink_wp_head', 10, 0 );
	
	// http://wordpress.stackexchange.com/a/185578/26817
	remove_action( 'admin_print_styles', 'print_emoji_styles' );
	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_filter( 'wp_mail', 'wp_staticize_emoji_for_email' );
	remove_filter( 'the_content_feed', 'wp_staticize_emoji' );
	remove_filter( 'comment_text_rss', 'wp_staticize_emoji' );
	add_filter( 'emoji_svg_url', '__return_false' );
	add_filter( 'tiny_mce_plugins', 'rational_tiny_mce_plugins_clean' );
	
	// http://wordpress.stackexchange.com/a/211469/26817
	remove_action( 'wp_head', 'rest_output_link_wp_head' );
	remove_action( 'wp_head', 'wp_oembed_add_discovery_links' );
	remove_action( 'template_redirect', 'rest_output_link_header', 11, 0 );
	
}
add_action( 'init', 'prefix_clean_wp_head' );

/**
 * Filtering TinyMCE plugins
 *
 * @param	array	$plugins	Array of TinyMCE plugins
 *
 * @return	array				Filtered array of TinyMCE plugins
 */
function rational_tiny_mce_plugins( $plugins ) {
	if ( is_array( $plugins ) ){
	  return array_diff( $plugins, array( 'wpemoji' ) );
	}else{
	  return [];
	}
}