WordPress performance & optimisation functions

Below you can find a selection of functions that go in every project, that will instantly improve performance and pagespeed for a website without impacting usability and stability. Everything goes in your functions.php file

remove_action('wp_head', 'print_emoji_detection_script', 7);
remove_action('wp_print_styles', 'print_emoji_styles');

remove_action( 'admin_print_scripts', 'print_emoji_detection_script' );
remove_action( 'admin_print_styles', 'print_emoji_styles' );

remove_action( 'wp_head', 'feed_links_extra', 3 ); // Removes extra feed links
remove_action( 'wp_head', 'feed_links', 2 ); // Removes default feed links
remove_action( 'wp_head', 'rsd_link' ); // Removes RDS links
remove_action( 'wp_head', 'wlwmanifest_link' ); // Removes default manifest
remove_action( 'wp_head', 'wp_generator' ); // Removes generator and version

// Removes ID from stylesheets making caching possible
function hey_remove_style_id($link) {
	return preg_replace('/ id=["|\']{1}.*-css["|\']{1} /', '', $link);
}
add_filter('style_loader_tag', 'hey_remove_style_id',9999);