diff --git a/admin/class-nginx-helper-admin.php b/admin/class-nginx-helper-admin.php
index aeac55d..3c99f18 100644
--- a/admin/class-nginx-helper-admin.php
+++ b/admin/class-nginx-helper-admin.php
@@ -20,7 +20,7 @@
  * @author     rtCamp
  */
 class Nginx_Helper_Admin {
-
+	
 	/**
 	 * The ID of this plugin.
 	 *
@@ -29,7 +29,7 @@ class Nginx_Helper_Admin {
 	 * @var      string    $plugin_name    The ID of this plugin.
 	 */
 	private $plugin_name;
-
+	
 	/**
 	 * The version of this plugin.
 	 *
@@ -38,7 +38,7 @@ class Nginx_Helper_Admin {
 	 * @var      string    $version    The current version of this plugin.
 	 */
 	private $version;
-
+	
 	/**
 	 * Various settings tabs.
 	 *
@@ -47,7 +47,7 @@ class Nginx_Helper_Admin {
 	 * @var      string    $settings_tabs    Various settings tabs.
 	 */
 	private $settings_tabs;
-
+	
 	/**
 	 * Purge options.
 	 *
@@ -56,7 +56,7 @@ class Nginx_Helper_Admin {
 	 * @var      string[]    $options    Purge options.
 	 */
 	public $options;
-
+	
 	/**
 	 * WP-CLI Command.
 	 *
@@ -65,7 +65,7 @@ class Nginx_Helper_Admin {
 	 * @var      string    $options    WP-CLI Command.
 	 */
 	const WP_CLI_COMMAND = 'nginx-helper';
-
+	
 	/**
 	 * Initialize the class and set its properties.
 	 *
@@ -74,10 +74,10 @@ class Nginx_Helper_Admin {
 	 * @param      string $version    The version of this plugin.
 	 */
 	public function __construct( $plugin_name, $version ) {
-
+		
 		$this->plugin_name = $plugin_name;
 		$this->version     = $version;
-
+		
 		/**
 		 * Define settings tabs
 		 */
@@ -94,11 +94,10 @@ public function __construct( $plugin_name, $version ) {
 				),
 			)
 		);
-
+		
 		$this->options = $this->nginx_helper_settings();
-
 	}
-
+	
 	/**
 	 * Register the stylesheets for the admin area.
 	 *
@@ -107,7 +106,7 @@ public function __construct( $plugin_name, $version ) {
 	 * @param string $hook The current admin page.
 	 */
 	public function enqueue_styles( $hook ) {
-
+		
 		/**
 		 * This function is provided for demonstration purposes only.
 		 *
@@ -119,16 +118,16 @@ public function enqueue_styles( $hook ) {
 		 * between the defined hooks and the functions defined in this
 		 * class.
 		 */
-
+		
 		if ( 'settings_page_nginx' !== $hook ) {
 			return;
 		}
-
+		
 		wp_enqueue_style( $this->plugin_name . '-icons', plugin_dir_url( __FILE__ ) . 'icons/css/nginx-fontello.css', array(), $this->version, 'all' );
 		wp_enqueue_style( $this->plugin_name, plugin_dir_url( __FILE__ ) . 'css/nginx-helper-admin.css', array(), $this->version, 'all' );
-
+		
 	}
-
+	
 	/**
 	 * Register the JavaScript for the admin area.
 	 *
@@ -137,7 +136,7 @@ public function enqueue_styles( $hook ) {
 	 * @param string $hook The current admin page.
 	 */
 	public function enqueue_scripts( $hook ) {
-
+		
 		/**
 		 * This function is provided for demonstration purposes only.
 		 *
@@ -149,29 +148,29 @@ public function enqueue_scripts( $hook ) {
 		 * between the defined hooks and the functions defined in this
 		 * class.
 		 */
-
+		
 		if ( 'settings_page_nginx' !== $hook ) {
 			return;
 		}
-
+		
 		wp_enqueue_script( $this->plugin_name, plugin_dir_url( __FILE__ ) . 'js/nginx-helper-admin.js', array( 'jquery' ), $this->version, false );
-
+		
 		$do_localize = array(
 			'purge_confirm_string' => esc_html__( 'Purging entire cache is not recommended. Would you like to continue?', 'nginx-helper' ),
 		);
 		wp_localize_script( $this->plugin_name, 'nginx_helper', $do_localize );
-
+		
 	}
-
+	
 	/**
 	 * Add admin menu.
 	 *
 	 * @since    2.0.0
 	 */
 	public function nginx_helper_admin_menu() {
-
+		
 		if ( is_multisite() ) {
-
+			
 			add_submenu_page(
 				'settings.php',
 				__( 'Nginx Helper', 'nginx-helper' ),
@@ -180,9 +179,9 @@ public function nginx_helper_admin_menu() {
 				'nginx',
 				array( &$this, 'nginx_helper_setting_page' )
 			);
-
+			
 		} else {
-
+			
 			add_submenu_page(
 				'options-general.php',
 				__( 'Nginx Helper', 'nginx-helper' ),
@@ -191,22 +190,22 @@ public function nginx_helper_admin_menu() {
 				'nginx',
 				array( &$this, 'nginx_helper_setting_page' )
 			);
-
+			
 		}
-
+		
 	}
-
+	
 	/**
 	 * Function to add toolbar purge link.
 	 *
 	 * @param object $wp_admin_bar Admin bar object.
 	 */
 	public function nginx_helper_toolbar_purge_link( $wp_admin_bar ) {
-
+		
 		if ( ! current_user_can( 'manage_options' ) ) {
 			return;
 		}
-
+		
 		if ( is_admin() ) {
 			$nginx_helper_urls = 'all';
 			$link_title        = __( 'Purge Cache', 'nginx-helper' );
@@ -214,16 +213,16 @@ public function nginx_helper_toolbar_purge_link( $wp_admin_bar ) {
 			$nginx_helper_urls = 'current-url';
 			$link_title        = __( 'Purge Current Page', 'nginx-helper' );
 		}
-
+		
 		$purge_url = add_query_arg(
 			array(
 				'nginx_helper_action' => 'purge',
 				'nginx_helper_urls'   => $nginx_helper_urls,
 			)
 		);
-
+		
 		$nonced_url = wp_nonce_url( $purge_url, 'nginx_helper-purge_all' );
-
+		
 		$wp_admin_bar->add_menu(
 			array(
 				'id'    => 'nginx-helper-purge-all',
@@ -232,9 +231,9 @@ public function nginx_helper_toolbar_purge_link( $wp_admin_bar ) {
 				'meta'  => array( 'title' => $link_title ),
 			)
 		);
-
+		
 	}
-
+	
 	/**
 	 * Display settings.
 	 *
@@ -245,7 +244,7 @@ public function nginx_helper_toolbar_purge_link( $wp_admin_bar ) {
 	public function nginx_helper_setting_page() {
 		include plugin_dir_path( __FILE__ ) . 'partials/nginx-helper-admin-display.php';
 	}
-
+	
 	/**
 	 * Default settings.
 	 *
@@ -253,7 +252,7 @@ public function nginx_helper_setting_page() {
 	 * @return array
 	 */
 	public function nginx_helper_default_settings() {
-
+		
 		return array(
 			'enable_purge'                     => 0,
 			'cache_method'                     => 'enable_fastcgi',
@@ -278,8 +277,10 @@ public function nginx_helper_default_settings() {
 			'redis_prefix'                     => 'nginx-cache:',
 			'purge_url'                        => '',
 			'redis_enabled_by_constant'        => 0,
+			'preload_cache'                    => 0,
+			'is_cache_preloaded'               => 0
 		);
-
+		
 	}
     
     public function store_default_options() {
@@ -310,7 +311,7 @@ public function store_default_options() {
 	 * @since    2.0.0
 	 */
 	public function nginx_helper_settings() {
-
+		
 		$options = get_site_option(
 			'rt_wp_nginx_helper_options',
 			array(
@@ -319,33 +320,33 @@ public function nginx_helper_settings() {
 				'redis_prefix'   => 'nginx-cache:',
 			)
 		);
-
+		
 		$data = wp_parse_args(
 			$options,
 			$this->nginx_helper_default_settings()
 		);
-
+		
 		$is_redis_enabled = (
 			defined( 'RT_WP_NGINX_HELPER_REDIS_HOSTNAME' ) &&
 			defined( 'RT_WP_NGINX_HELPER_REDIS_PORT' ) &&
 			defined( 'RT_WP_NGINX_HELPER_REDIS_PREFIX' )
 		);
-
+		
 		if ( ! $is_redis_enabled ) {
 			return $data;
 		}
-
+		
 		$data['redis_enabled_by_constant'] = $is_redis_enabled;
 		$data['enable_purge']              = $is_redis_enabled;
 		$data['cache_method']              = 'enable_redis';
 		$data['redis_hostname']            = RT_WP_NGINX_HELPER_REDIS_HOSTNAME;
 		$data['redis_port']                = RT_WP_NGINX_HELPER_REDIS_PORT;
-		$data['redis_prefix']              = RT_WP_NGINX_HELPER_REDIS_PREFIX;
-
+		$data['redis_prefix']               = RT_WP_NGINX_HELPER_REDIS_PREFIX;
+		
 		return $data;
-
+		
 	}
-
+	
 	/**
 	 * Nginx helper setting link function.
 	 *
@@ -354,20 +355,20 @@ public function nginx_helper_settings() {
 	 * @return mixed
 	 */
 	public function nginx_helper_settings_link( $links ) {
-
+		
 		if ( is_network_admin() ) {
 			$setting_page = 'settings.php';
 		} else {
 			$setting_page = 'options-general.php';
 		}
-
+		
 		$settings_link = '<a href="' . network_admin_url( $setting_page . '?page=nginx' ) . '">' . __( 'Settings', 'nginx-helper' ) . '</a>';
 		array_unshift( $links, $settings_link );
-
+		
 		return $links;
-
+		
 	}
-
+	
 	/**
 	 * Check if the nginx log is enabled.
 	 *
@@ -375,20 +376,20 @@ public function nginx_helper_settings_link( $links ) {
 	 * @return    boolean
 	 */
 	public function is_nginx_log_enabled() {
-
+		
 		$options = get_site_option( 'rt_wp_nginx_helper_options', array() );
-
+		
 		if ( ! empty( $options['enable_log'] ) && 1 === (int) $options['enable_log'] ) {
 			return true;
 		}
-
+		
 		if ( defined( 'NGINX_HELPER_LOG' ) && true === NGINX_HELPER_LOG ) {
 			return true;
 		}
-
+		
 		return false;
 	}
-
+	
 	/**
 	 * Retrieve the asset path.
 	 *
@@ -396,13 +397,13 @@ public function is_nginx_log_enabled() {
 	 * @return    string    asset path of the plugin.
 	 */
 	public function functional_asset_path() {
-
+		
 		$log_path = WP_CONTENT_DIR . '/uploads/nginx-helper/';
-
+		
 		return apply_filters( 'nginx_asset_path', $log_path );
-
+		
 	}
-
+	
 	/**
 	 * Retrieve the asset url.
 	 *
@@ -410,82 +411,82 @@ public function functional_asset_path() {
 	 * @return    string    asset url of the plugin.
 	 */
 	public function functional_asset_url() {
-
+		
 		$log_url = WP_CONTENT_URL . '/uploads/nginx-helper/';
-
+		
 		return apply_filters( 'nginx_asset_url', $log_url );
-
+		
 	}
-
+	
 	/**
 	 * Get latest news.
 	 *
 	 * @since     2.0.0
 	 */
 	public function nginx_helper_get_feeds() {
-
+		
 		// Get RSS Feed(s).
 		require_once ABSPATH . WPINC . '/feed.php';
-
+		
 		$maxitems  = 0;
 		$rss_items = array();
-
+		
 		// Get a SimplePie feed object from the specified feed source.
 		$rss = fetch_feed( 'https://rtcamp.com/blog/feed/' );
-
+		
 		if ( ! is_wp_error( $rss ) ) { // Checks that the object is created correctly.
-
+			
 			// Figure out how many total items there are, but limit it to 5.
 			$maxitems = $rss->get_item_quantity( 5 );
 			// Build an array of all the items, starting with element 0 (first element).
 			$rss_items = $rss->get_items( 0, $maxitems );
-
+			
 		}
 		?>
-		<ul role="list">
+        <ul role="list">
 			<?php
 			if ( 0 === $maxitems ) {
 				echo '<li role="listitem">' . esc_html_e( 'No items', 'nginx-helper' ) . '.</li>';
 			} else {
-
+				
 				// Loop through each feed item and display each item as a hyperlink.
 				foreach ( $rss_items as $item ) {
 					?>
-						<li role="listitem">
-							<?php
-								printf(
-									'<a href="%s" title="%s">%s</a>',
-									esc_url( $item->get_permalink() ),
-									esc_attr__( 'Posted ', 'nginx-helper' ) . esc_attr( $item->get_date( 'j F Y | g:i a' ) ),
-									esc_html( $item->get_title() )
-								);
-							?>
-						</li>
+                    <li role="listitem">
+						<?php
+						printf(
+							'<a href="%s" title="%s">%s</a>',
+							esc_url( $item->get_permalink() ),
+							esc_attr__( 'Posted ', 'nginx-helper' ) . esc_attr( $item->get_date( 'j F Y | g:i a' ) ),
+							esc_html( $item->get_title() )
+						);
+						?>
+                    </li>
 					<?php
 				}
 			}
 			?>
-		</ul>
+        </ul>
 		<?php
 		die();
-
+		
 	}
-
+	
 	/**
 	 * Add time stamps in html.
 	 */
 	public function add_timestamps() {
-
+		
 		global $pagenow;
-
+		
 		if ( is_admin() || 1 !== (int) $this->options['enable_purge'] || 1 !== (int) $this->options['enable_stamp'] ) {
 			return;
 		}
-
+		
 		if ( ! empty( $pagenow ) && 'wp-login.php' === $pagenow ) {
 			return;
 		}
-
+		
 		foreach ( headers_list() as $header ) {
 			list( $key, $value ) = explode( ':', $header, 2 );
 			$key                 = strtolower( $key );
@@ -496,32 +497,32 @@ public function add_timestamps() {
 				break;
 			}
 		}
-
+		
 		/**
 		 * Don't add timestamp if run from ajax, cron or wpcli.
 		 */
 		if ( defined( 'DOING_AJAX' ) && DOING_AJAX ) {
 			return;
 		}
-
+		
 		if ( defined( 'DOING_CRON' ) && DOING_CRON ) {
 			return;
 		}
-
+		
 		if ( defined( 'WP_CLI' ) && WP_CLI ) {
 			return;
 		}
-
+		
 		$timestamps = "\n<!--" .
-				'Cached using Nginx-Helper on ' . current_time( 'mysql' ) . '. ' .
-				'It took ' . get_num_queries() . ' queries executed in ' . timer_stop() . ' seconds.' .
-				"-->\n" .
-				'<!--Visit http://wordpress.org/extend/plugins/nginx-helper/faq/ for more details-->';
-
+			'Cached using Nginx-Helper on ' . current_time( 'mysql' ) . '. ' .
+			'It took ' . get_num_queries() . ' queries executed in ' . timer_stop() . ' seconds.' .
+			"-->\n" .
+			'<!--Visit http://wordpress.org/extend/plugins/nginx-helper/faq/ for more details-->';
+		
 		echo wp_kses( $timestamps, array() );
-
+		
 	}
-
+	
 	/**
 	 * Get map
 	 *
@@ -530,83 +531,83 @@ public function add_timestamps() {
 	 * @return string
 	 */
 	public function get_map() {
-
+		
 		if ( ! $this->options['enable_map'] ) {
 			return;
 		}
-
+		
 		if ( is_multisite() ) {
-
+			
 			global $wpdb;
-
+			
 			$rt_all_blogs = $wpdb->get_results(
 				$wpdb->prepare(
 					'SELECT blog_id, domain, path FROM ' . $wpdb->blogs . " WHERE site_id = %d AND archived = '0' AND mature = '0' AND spam = '0' AND deleted = '0'",
 					$wpdb->siteid
 				)
 			);
-
+			
 			$wpdb->dmtable = $wpdb->base_prefix . 'domain_mapping';
-
+			
 			$rt_domain_map_sites = '';
-
+			
 			if ( $wpdb->get_var( "SHOW TABLES LIKE '{$wpdb->dmtable}'" ) === $wpdb->dmtable ) { // phpcs:ignore
 				$rt_domain_map_sites = $wpdb->get_results( "SELECT blog_id, domain FROM {$wpdb->dmtable} ORDER BY id DESC" );
 			}
-
+			
 			$rt_nginx_map       = '';
 			$rt_nginx_map_array = array();
-
+			
 			if ( $rt_all_blogs ) {
-
+				
 				foreach ( $rt_all_blogs as $blog ) {
-
+					
 					if ( true === SUBDOMAIN_INSTALL ) {
 						$rt_nginx_map_array[ $blog->domain ] = $blog->blog_id;
 					} else {
-
+						
 						if ( 1 !== $blog->blog_id ) {
 							$rt_nginx_map_array[ $blog->path ] = $blog->blog_id;
 						}
 					}
 				}
 			}
-
+			
 			if ( $rt_domain_map_sites ) {
-
+				
 				foreach ( $rt_domain_map_sites as $site ) {
 					$rt_nginx_map_array[ $site->domain ] = $site->blog_id;
 				}
 			}
-
+			
 			foreach ( $rt_nginx_map_array as $domain => $domain_id ) {
 				$rt_nginx_map .= "\t" . $domain . "\t" . $domain_id . ";\n";
 			}
-
+			
 			return $rt_nginx_map;
-
+			
 		}
-
+		
 	}
-
+	
 	/**
 	 * Update map
 	 */
 	public function update_map() {
-
+		
 		if ( is_multisite() ) {
-
+			
 			$rt_nginx_map = $this->get_map();
-
+			
 			$fp = fopen( $this->functional_asset_path() . 'map.conf', 'w+' );
 			if ( $fp ) {
 				fwrite( $fp, $rt_nginx_map );
 				fclose( $fp );
 			}
 		}
-
+		
 	}
-
+	
 	/**
 	 * Purge url when post status is changed.
 	 *
@@ -618,28 +619,28 @@ public function update_map() {
 	 * @param object $post Post object.
 	 */
 	public function set_future_post_option_on_future_status( $new_status, $old_status, $post ) {
-
+		
 		global $blog_id, $nginx_purger;
-
+		
 		$exclude_post_types = array( 'nav_menu_item' );
-
+		
 		if ( in_array( $post->post_type, $exclude_post_types, true ) ) {
 			return;
 		}
-
-		if ( ! $this->options['enable_purge'] ) {
+		
+		if ( ! $this->options['enable_purge'] || $this->is_import_request() ) {
 			return;
 		}
-
+		
 		$purge_status = array( 'publish', 'future' );
-
+		
 		if ( in_array( $old_status, $purge_status, true ) || in_array( $new_status, $purge_status, true ) ) {
-
+			
 			$nginx_purger->log( 'Purge post on transition post STATUS from ' . $old_status . ' to ' . $new_status );
 			$nginx_purger->purge_post( $post->ID );
-
+			
 		}
-
+		
 		if (
 			'future' === $new_status && $post && 'future' === $post->post_status &&
 			(
@@ -650,15 +651,15 @@ public function set_future_post_option_on_future_status( $new_status, $old_statu
 				)
 			)
 		) {
-
+			
 			$nginx_purger->log( 'Set/update future_posts option ( post id = ' . $post->ID . ' and blog id = ' . $blog_id . ' )' );
 			$this->options['future_posts'][ $blog_id ][ $post->ID ] = strtotime( $post->post_date_gmt ) + 60;
 			update_site_option( 'rt_wp_nginx_helper_options', $this->options );
-
+			
 		}
-
+		
 	}
-
+	
 	/**
 	 * Unset future post option on delete
 	 *
@@ -668,9 +669,9 @@ public function set_future_post_option_on_future_status( $new_status, $old_statu
 	 * @param int $post_id Post id.
 	 */
 	public function unset_future_post_option_on_delete( $post_id ) {
-
+		
 		global $blog_id, $nginx_purger;
-
+		
 		if (
 			! $this->options['enable_purge'] ||
 			empty( $this->options['future_posts'] ) ||
@@ -680,18 +681,18 @@ public function unset_future_post_option_on_delete( $post_id ) {
 		) {
 			return;
 		}
-
+		
 		$nginx_purger->log( 'Unset future_posts option ( post id = ' . $post_id . ' and blog id = ' . $blog_id . ' )' );
-
+		
 		unset( $this->options['future_posts'][ $blog_id ][ $post_id ] );
-
+		
 		if ( ! count( $this->options['future_posts'][ $blog_id ] ) ) {
 			unset( $this->options['future_posts'][ $blog_id ] );
 		}
-
+		
 		update_site_option( 'rt_wp_nginx_helper_options', $this->options );
 	}
-
+	
 	/**
 	 * Update map when new blog added in multisite.
 	 *
@@ -700,18 +701,18 @@ public function unset_future_post_option_on_delete( $post_id ) {
 	 * @param string $blog_id blog id.
 	 */
 	public function update_new_blog_options( $blog_id ) {
-
+		
 		global $nginx_purger;
-
+		
 		$nginx_purger->log( "New site added ( id $blog_id )" );
 		$this->update_map();
 		$nginx_purger->log( "New site added to nginx map ( id $blog_id )" );
 		$helper_options = $this->nginx_helper_default_settings();
 		update_blog_option( $blog_id, 'rt_wp_nginx_helper_options', $helper_options );
 		$nginx_purger->log( "Default options updated for the new blog ( id $blog_id )" );
-
+		
 	}
-
+	
 	/**
 	 * Purge all urls.
 	 * Purge current page cache when purging is requested from front
@@ -720,14 +721,18 @@ public function update_new_blog_options( $blog_id ) {
 	 * @global object $nginx_purger
 	 */
 	public function purge_all() {
-
+		
+		if ( $this->is_import_request() ) {
+			return;
+		}
+		
 		global $nginx_purger, $wp;
-
+		
 		$method = null;
 		if ( isset( $_SERVER['REQUEST_METHOD'] ) ) {
 			$method = wp_strip_all_tags( $_SERVER['REQUEST_METHOD'] );
 		}
-
+		
 		$action = '';
 		if ( 'POST' === $method ) {
 			if ( isset( $_POST['nginx_helper_action'] ) ) {
@@ -738,34 +743,34 @@ public function purge_all() {
 				$action = wp_strip_all_tags( $_GET['nginx_helper_action'] );
 			}
 		}
-
+		
 		if ( empty( $action ) ) {
 			return;
 		}
-
+		
 		if ( ! current_user_can( 'manage_options' ) ) {
 			wp_die( 'Sorry, you do not have the necessary privileges to edit these options.' );
 		}
-
+		
 		if ( 'done' === $action ) {
-
+			
 			add_action( 'admin_notices', array( &$this, 'display_notices' ) );
 			add_action( 'network_admin_notices', array( &$this, 'display_notices' ) );
 			return;
-
+			
 		}
-
+		
 		check_admin_referer( 'nginx_helper-purge_all' );
-
+		
 		$current_url = user_trailingslashit( home_url( $wp->request ) );
-
+		
 		if ( ! is_admin() ) {
 			$action       = 'purge_current_page';
 			$redirect_url = $current_url;
 		} else {
 			$redirect_url = add_query_arg( array( 'nginx_helper_action' => 'done' ) );
 		}
-
+		
 		switch ( $action ) {
 			case 'purge':
 				$nginx_purger->purge_all();
@@ -774,28 +779,138 @@ public function purge_all() {
 				$nginx_purger->purge_url( $current_url );
 				break;
 		}
-
+		
 		if ( 'purge' === $action ) {
-
+			
 			/**
 			 * Fire an action after the entire cache has been purged whatever caching type is used.
 			 *
 			 * @since 2.2.2
 			 */
 			do_action( 'rt_nginx_helper_after_purge_all' );
-
+			
 		}
-
+		
 		wp_redirect( esc_url_raw( $redirect_url ) );
 		exit();
-
+		
 	}
-
+	
 	/**
 	 * Dispay plugin notices.
 	 */
 	public function display_notices() {
 		echo '<div class="updated"><p>' . esc_html__( 'Purge initiated', 'nginx-helper' ) . '</p></div>';
 	}
-
+	
+	/**
+	 * Preloads the cache for the website.
+	 *
+	 * @return void
+	 */
+	public function preload_cache() {
+		$is_cache_preloaded    = $this->options['is_cache_preloaded'];
+		$preload_cache_enabled = $this->options['preload_cache'];
+		
+		if ( $preload_cache_enabled && false === boolval( $is_cache_preloaded ) ) {
+			$this->options['is_cache_preloaded'] = true;
+			
+			update_site_option( 'rt_wp_nginx_helper_options', $this->options );
+			$this->preload_cache_from_sitemap();
+		}
+	}
+	
+	/**
+	 * This function preloads the cache from sitemap url.
+	 *
+	 * @return void
+	 */
+	private function preload_cache_from_sitemap() {
+		
+		$sitemap_urls = $this->get_index_sitemap_urls();
+		$all_urls     = array();
+		
+		foreach ( $sitemap_urls as $sitemap_url ) {
+			$urls = $this->extract_sitemap_urls( $sitemap_url );
+			$all_urls = array_merge( $all_urls, $urls );
+		}
+		
+		$args = array(
+			'timeout'   => 1,
+			'blocking'  => false,
+			'sslverify' => false,
+		);
+		
+		foreach ( $all_urls as $url ) {
+			wp_remote_get( esc_url_raw( $url ), $args );
+		}
+		
+	}
+	
+	/**
+	 * Fetches all the sitemap urls for the site.
+	 *
+	 * @return array
+	 */
+	private function get_index_sitemap_urls() {
+		$sitemaps = wp_sitemaps_get_server()->index->get_sitemap_list();
+		$urls     = array();
+		foreach ( $sitemaps as $sitemap ) {
+			$urls[] = $sitemap['loc'];
+		}
+		return $urls;
+	}
+	
+	/**
+	 * Parse sitemap content and extract all URLs.
+	 *
+	 * @param string $sitemap_url The URL of the sitemap.
+	 * @return array|WP_Error An array of URLs or WP_Error on failure.
+	 */
+	private function extract_sitemap_urls( $sitemap_url ) {
+		$response = wp_remote_get( $sitemap_url );
+		
+		$urls = array();
+		
+		if ( is_wp_error( $response ) ) {
+			return $urls;
+		}
+		
+		$sitemap_content = wp_remote_retrieve_body( $response );
+		
+		libxml_use_internal_errors( true );
+		$xml = simplexml_load_string( $sitemap_content );
+		
+		if ( false === $xml ) {
+			return new WP_Error( 'sitemap_parse_error', esc_html__( 'Failed to parse the sitemap XML', 'nginx-helper' ) );
+		}
+		
+		$urls = array();
+		
+		if ( $xml === false ) {
+			return $urls;
+		}
+		
+		foreach ( $xml->url as $url ) {
+			$urls[] = (string) $url->loc;
+		}
+		
+		return $urls;
+	}
+    
+    /**
+    * Determines if the current request is for importing Posts/ WordPress content.
+    *
+    * @return bool True if the request is for importing, false otherwise.
+    */
+	public function is_import_request() {
+		$import_query_var   = sanitize_text_field( wp_unslash( $_GET['import'] ?? '' ) ); //phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Nonce is already in the admin dashboard.
+		$has_import_started = did_action( 'import_start' );
+		
+		return ( defined( 'WP_IMPORTING' ) && true === WP_IMPORTING )
+			|| 0 !== $has_import_started
+			|| ! empty( $import_query_var );
+	}
+	
+	
 }