Optimize css resource loading

Author: adamwoodnz

source/wp-content/themes/wporg-main-2022/functions.php

@@ -18,13 +18,17 @@
  * Actions and filters.
  */
 add_action( 'wp_enqueue_scripts', __NAMESPACE__ . '\enqueue_assets' );
+add_action( 'wp_enqueue_scripts', __NAMESPACE__ . '\maybe_dequeue_assets' );
 add_action( 'init', __NAMESPACE__ . '\register_shortcodes' );
 add_filter( 'wp_img_tag_add_loading_attr', __NAMESPACE__ . '\override_lazy_loading', 10, 2 );
 add_filter( 'wporg_block_site_breadcrumbs', __NAMESPACE__ . '\update_site_breadcrumbs' );
 add_filter( 'render_block_core/site-title', __NAMESPACE__ . '\use_parent_page_title', 10, 3 );
 add_filter( 'render_block_data', __NAMESPACE__ . '\update_header_template_part_class' );
 add_filter( 'wporg_block_navigation_menus', __NAMESPACE__ . '\add_site_navigation_menus' );
 
+// Remove Jetpack CSS on frontend
+add_filter( 'jetpack_implode_frontend_css', '__return_false', 99 );
+
 /**
  * Enqueue scripts and styles.
  */
@@ -96,6 +100,16 @@ function enqueue_assets() {
 	}
 }
 
+/**
+ * Dequeue or deregister some scripts and styles on frontend for performance.
+ */
+function maybe_dequeue_assets() {
+	if ( ! is_user_logged_in() && is_front_page() ) {
+		wp_deregister_style( 'dashicons' );
+		wp_deregister_style( 'wp-mediaelement' );
+	}
+}
+
 /**
  * Load the shortcodes available for the theme.
  */