diff --git a/lib/Cron/Daemon.php b/lib/Cron/Daemon.php
index 0113d9f761..b86ac388b1 100644
--- a/lib/Cron/Daemon.php
+++ b/lib/Cron/Daemon.php
@@ -1,8 +1,8 @@
 <?php
 namespace MailPoet\Cron;
 
-use MailPoet\Cron\Workers\Scheduler;
-use MailPoet\Cron\Workers\SendingQueue;
+use MailPoet\Cron\Workers\Scheduler as SchedulerWorker;
+use MailPoet\Cron\Workers\SendingQueue\SendingQueue as SendingQueueWorker;
 
 require_once(ABSPATH . 'wp-includes/pluggable.php');
 
@@ -41,22 +41,22 @@ class Daemon {
     }
     $this->abortIfStopped($daemon);
     try {
-      $scheduler = new Scheduler();
-      $scheduler->process($this->timer);
-      $queue = new SendingQueue();
-      $queue->process($this->timer);
+      $scheduler = new SchedulerWorker($this->timer);
+      $scheduler->process();
+      $queue = new SendingQueueWorker($this->timer);
+      $queue->process();
     } catch(\Exception $e) {
-      // continue processing, no need to catch errors
+      // continue processing, no need to handle errors
     }
     $elapsed_time = microtime(true) - $this->timer;
     if($elapsed_time < CronHelper::DAEMON_EXECUTION_LIMIT) {
       sleep(CronHelper::DAEMON_EXECUTION_LIMIT - $elapsed_time);
     }
-    // after each execution, re-read daemon data in case it was deleted or
+    // after each execution, re-read daemon data in case its status was changed
     // its status has changed
     $daemon = CronHelper::getDaemon();
     if(!$daemon || $daemon['token'] !== $this->data['token']) {
-      exit;
+      self::terminate();
     }
     $daemon['counter']++;
     $this->abortIfStopped($daemon);
@@ -69,11 +69,13 @@ class Daemon {
   }
 
   function abortIfStopped($daemon) {
-    if($daemon['status'] === self::STATUS_STOPPED) exit;
+    if($daemon['status'] === self::STATUS_STOPPED) {
+      self::terminate();
+    }
     if($daemon['status'] === self::STATUS_STOPPING) {
       $daemon['status'] = self::STATUS_STOPPED;
       CronHelper::saveDaemon($daemon);
-      exit;
+      self::terminate();
     }
   }
 
@@ -83,6 +85,10 @@ class Daemon {
 
   function callSelf() {
     CronHelper::accessDaemon($this->token, self::REQUEST_TIMEOUT);
+    self::terminate();
+  }
+
+  function terminate() {
     exit;
   }
 }
\ No newline at end of file
diff --git a/lib/Cron/Supervisor.php b/lib/Cron/Supervisor.php
index f89f51dfa0..a598283e85 100644
--- a/lib/Cron/Supervisor.php
+++ b/lib/Cron/Supervisor.php
@@ -26,7 +26,6 @@ class Supervisor {
       $daemon['status'] === Daemon::STATUS_STOPPED
     ) {
       return $this->formatDaemonStatusMessage($daemon['status']);
-
     }
     $elapsed_time = time() - (int)$daemon['updated_at'];
     // if it's been less than 40 seconds since last execution and we're not
diff --git a/lib/Cron/Workers/SendingQueue/SendingQueue.php b/lib/Cron/Workers/SendingQueue/SendingQueue.php
index f794838c70..2d2b7aa561 100644
--- a/lib/Cron/Workers/SendingQueue/SendingQueue.php
+++ b/lib/Cron/Workers/SendingQueue/SendingQueue.php
@@ -4,51 +4,48 @@ namespace MailPoet\Cron\Workers\SendingQueue;
 use MailPoet\Cron\CronHelper;
 use MailPoet\Cron\Workers\SendingQueue\Tasks\Mailer as MailerTask;
 use MailPoet\Cron\Workers\SendingQueue\Tasks\Newsletter as NewsletterTask;
-use MailPoet\Cron\Workers\SendingQueue\Tasks\Statistics as StatisticsTask;
 use MailPoet\Cron\Workers\SendingQueue\Tasks\Subscribers as SubscribersTask;
 use MailPoet\Models\Newsletter as NewsletterModel;
 use MailPoet\Models\SendingQueue as SendingQueueModel;
-use MailPoet\Models\Subscriber;
+use MailPoet\Models\StatisticsNewsletters as StatisticsNewslettersModel;
+use MailPoet\Models\Subscriber as SubscriberModel;
 use MailPoet\Util\Helpers;
 
 if(!defined('ABSPATH')) exit;
 
 class SendingQueue {
-  public $mta_config;
+  public $mailer_task;
+  public $newsletter_task;
   private $timer;
   const BATCH_SIZE = 50;
 
   function __construct($timer = false) {
-    $this->mta_config = MailerTask::getMailerConfig();
+    $this->mailer_task = new MailerTask();
+    $this->newsletter_task = new NewsletterTask();
     $this->timer = ($timer) ? $timer : microtime(true);
-    CronHelper::checkExecutionTimer($this->timer);
   }
 
   function process() {
-    return;
-    $mta_log = MailerTask::getMailerLog();
-    MailerTask::checkSendingLimit($this->mta_config, $mta_log);
+    $this->mailer_task->checkSendingLimit();
     foreach($this->getQueues() as $queue) {
       // get and pre-process newsletter (render, replace shortcodes/links, etc.)
-      $newsletter = NewsletterTask::getAndPreProcess($queue->asArray());
+      $newsletter = $this->newsletter_task->getAndPreProcess($queue->asArray());
       if(!$newsletter) {
         $queue->delete();
         continue;
       }
       if(is_null($queue->newsletter_rendered_body)) {
         $queue->newsletter_rendered_body = json_encode($newsletter['rendered_body']);
-        //$queue->save();
+        $queue->save();
       }
       // get subscribers
-      $queue->subscribers = SubscribersTask::get($queue->asArray());
+      $queue->subscribers = SubscribersTask::get($queue->subscribers);
       // configure mailer with newsletter data (from/reply-to)
-      $mailer = MailerTask::configureMailer($newsletter);
-      // determine if processing is done in bulk or individually
-      $processing_method = MailerTask::getProcessingMethod($this->mta_config);
+      $mailer = $this->mailer_task->configureMailer($newsletter);
       foreach(array_chunk($queue->subscribers['to_process'], self::BATCH_SIZE)
               as $subscribers_to_process_ids
       ) {
-        $found_subscribers = Subscriber::whereIn('id', $subscribers_to_process_ids)
+        $found_subscribers = SubscriberModel::whereIn('id', $subscribers_to_process_ids)
           ->findArray();
         $found_subscribers_ids = Helpers::arrayColumn($found_subscribers, 'id');
         // if some subscribers weren't found, remove them from the processing list
@@ -63,30 +60,26 @@ class SendingQueue {
           $this->updateQueue($queue);
           continue;
         }
-        $queue->subscribers = call_user_func_array(
-          array(
-            $this,
-            $processing_method
-          ),
-          array(
-            $mailer,
-            $mta_log,
-            $newsletter,
-            $found_subscribers,
-            $queue
-          )
+        $queue = $this->processQueue(
+          $queue,
+          $mailer,
+          $newsletter,
+          $found_subscribers
         );
       }
     }
   }
 
-  // TODO: merge processBulkSubscribers with processIndividualSubscriber
-  function processBulkSubscribers($mailer, $mta_log, $newsletter, $subscribers, $queue) {
-    $subscribers_ids = Helpers::arrayColumn($subscribers, 'id');
+  function processQueue($queue, $mailer, $newsletter, $subscribers) {
+    // determine if processing is done in bulk or individually
+    $processing_method = $this->mailer_task->getProcessingMethod();
+    $prepared_newsletters = array();
+    $prepared_subscribers = array();
+    $statistics = array();
     foreach($subscribers as $subscriber) {
       // render shortcodes and replace subscriber data in tracked links
       $prepared_newsletters[] =
-        NewsletterTask::prepareNewsletterForSending(
+        $this->newsletter_task->prepareNewsletterForSending(
           $newsletter,
           $subscriber,
           $queue->asArray()
@@ -95,13 +88,53 @@ class SendingQueue {
         $queue->newsletter_rendered_subject = $prepared_newsletters[0]['subject'];
       }
       // format subscriber name/address according to mailer settings
-      $prepared_subscribers[] = MailerTask::prepareSubscriberForSending(
+      $prepared_subscribers[] = $this->mailer_task->prepareSubscriberForSending(
         $mailer,
         $subscriber
       );
+      $prepared_subscribers_ids[] = $subscriber['id'];
+      // keep track of values for statistics purposes
+      $statistics[] = array(
+        'newsletter_id' => $newsletter['id'],
+        'subscriber_id' => $subscriber['id'],
+        'queue_id' => $queue->id
+      );
+      if($processing_method === 'individual') {
+        $queue = $this->sendNewsletters(
+          $queue,
+          $mailer,
+          $prepared_subscribers_ids,
+          $prepared_newsletters[0],
+          $prepared_subscribers[0],
+          $statistics
+        );
+        $prepared_newsletters = array();
+        $prepared_subscribers = array();
+        $statistics = array();
+      }
     }
-    // send
-    $send_result = MailerTask::send($mailer, $prepared_newsletters, $prepared_subscribers);
+    if($processing_method === 'bulk') {
+      $queue = $this->sendNewsletters(
+        $queue,
+        $mailer,
+        $prepared_subscribers_ids,
+        $prepared_newsletters,
+        $prepared_subscribers,
+        $statistics
+      );
+    }
+    return $queue;
+  }
+
+  function sendNewsletters(
+    $queue, $mailer, $subscribers_ids, $newsletters, $subscribers, $statistics
+  ) {
+    // send newsletter
+    $send_result = $this->mailer_task->send(
+      $mailer,
+      $newsletters,
+      $subscribers
+    );
     if(!$send_result) {
       // update failed/to process list
       $queue->subscribers = SubscribersTask::updateFailedList(
@@ -115,65 +148,17 @@ class SendingQueue {
         $queue->subscribers
       );
       // log statistics
-      StatisticsTask::processAndLogBulkNewsletterStatistics(
-        $subscribers_ids,
-        $newsletter['id'],
-        $queue->id
-      );
+      StatisticsNewslettersModel::createMultiple($statistics);
       // keep track of sent items
-      $mta_log = MailerTask::updateMailerLog($mta_log);
+      $this->mailer_task->updateMailerLog();
+      $subscribers_to_process_count = count($queue->subscribers['to_process']);
+    }
+    $queue = $this->updateQueue($queue);
+    if ($subscribers_to_process_count) {
+      $this->mailer_task->checkSendingLimit();
     }
-    $this->updateQueue($queue);
-    MailerTask::checkSendingLimit($this->mta_config, $mta_log);
     CronHelper::checkExecutionTimer($this->timer);
-  }
-
-  function processIndividualSubscriber($mailer, $mta_log, $newsletter, $subscribers, $queue) {
-    $subscribers_ids = Helpers::arrayColumn($subscribers, 'id');
-    foreach($subscribers as $subscriber) {
-      // render shortcodes and replace subscriber data in tracked links
-      $prepared_newsletter =
-        NewsletterTask::prepareNewsletterForSending(
-          $newsletter,
-          $subscriber,
-          $queue->asArray()
-        );
-      if(!$queue->newsletter_rendered_subject) {
-        $queue->newsletter_rendered_subject = $prepared_newsletter['subject'];
-      }
-      // format subscriber name/address according to mailer settings
-      $prepared_subscriber = MailerTask::prepareSubscriberForSending(
-        $mailer,
-        $subscriber
-      );
-      $send_result = MailerTask::send($mailer, $prepared_newsletter, $prepared_subscriber);
-      if(!$send_result) {
-        // update failed/to process list
-        $queue->subscribers = SubscribersTask::updateFailedList(
-          $subscribers_ids,
-          $queue->subscribers
-        );
-      } else {
-        // update processed/to process list
-        $queue->subscribers = SubscribersTask::updateProcessedList(
-          $subscribers_ids,
-          $queue->subscribers
-        );
-        // log statistics
-        StatisticsTask::logStatistics(
-          array(
-            $newsletter['id'],
-            $subscriber['id'],
-            $queue->id
-          )
-        );
-        // keep track of sent items
-        $mta_log = MailerTask::updateMailerLog($mta_log);
-      }
-      $queue = $this->updateQueue($queue);
-      MailerTask::checkSendingLimit($this->mta_config, $mta_log);
-      CronHelper::checkExecutionTimer($this->timer);
-    }
+    return $queue;
   }
 
   function getQueues() {
diff --git a/lib/Cron/Workers/SendingQueue/Tasks/Mailer.php b/lib/Cron/Workers/SendingQueue/Tasks/Mailer.php
index 9262167fca..b87eb13df9 100644
--- a/lib/Cron/Workers/SendingQueue/Tasks/Mailer.php
+++ b/lib/Cron/Workers/SendingQueue/Tasks/Mailer.php
@@ -7,7 +7,15 @@ use MailPoet\Models\Setting;
 if(!defined('ABSPATH')) exit;
 
 class Mailer {
-  static function configureMailer(array $newsletter) {
+  public $mta_config;
+  public $mta_log;
+
+  function __construct() {
+    $this->mta_config = $this->getMailerConfig();
+    $this->mta_log = $this->getMailerLog();
+  }
+
+  function configureMailer(array $newsletter) {
     $sender['address'] = (!empty($newsletter['sender_address'])) ?
       $newsletter['sender_address'] :
       false;
@@ -30,7 +38,7 @@ class Mailer {
     return $mailer;
   }
 
-  static function getMailerConfig() {
+  function getMailerConfig() {
     $mta_config = Setting::getValue('mta');
     if(!$mta_config) {
       throw new \Exception(__('Mailer is not configured.'));
@@ -38,13 +46,7 @@ class Mailer {
     return $mta_config;
   }
 
-  static function updateMailerLog($mta_log) {
-    $mta_log['sent']++;
-    Setting::setValue('mta_log', $mta_log);
-    return $mta_log;
-  }
-
-  static function getMailerLog() {
+  function getMailerLog() {
     $mta_log = Setting::getValue('mta_log');
     if(!$mta_log) {
       $mta_log = array(
@@ -56,40 +58,45 @@ class Mailer {
     return $mta_log;
   }
 
-  static function getProcessingMethod($mta_config) {
-    return ($mta_config['method'] === 'MailPoet') ?
-      'processBulkSubscribers' :
-      'processIndividualSubscriber';
+  function updateMailerLog() {
+    $this->mta_log['sent']++;
+    Setting::setValue('mta_log', $this->mta_log);
   }
 
-  static function prepareSubscriberForSending($mailer, $subscriber) {
+  function getProcessingMethod() {
+    return ($this->mta_config['method'] === 'MailPoet') ?
+      'bulk' :
+      'individual';
+  }
+
+  function prepareSubscriberForSending($mailer, $subscriber) {
     return ($mailer instanceof \MailPoet\Mailer\Mailer) ?
       $mailer->transformSubscriber($subscriber) :
       false;
   }
 
-  static function send($mailer, $newsletter, $subscriber) {
+  function send($mailer, $newsletter, $subscriber) {
     return ($mailer instanceof \MailPoet\Mailer\Mailer) ?
       $mailer->mailer_instance->send($newsletter, $subscriber) :
       false;
   }
 
-  static function checkSendingLimit($mta_config, $mta_log) {
-    $frequency_interval = (int) $mta_config['frequency']['interval'] * 60;
-    $frequency_limit = (int) $mta_config['frequency']['emails'];
-    $elapsed_time = time() - (int) $mta_log['started'];
-    if($mta_log['sent'] === $frequency_limit &&
+  function checkSendingLimit() {
+    if($this->mta_config['method'] === 'MailPoet') return;
+    $frequency_interval = (int) $this->mta_config['frequency']['interval'] * 60;
+    $frequency_limit = (int) $this->mta_config['frequency']['emails'];
+    $elapsed_time = time() - (int) $this->mta_log['started'];
+    if($this->mta_log['sent'] === $frequency_limit &&
       $elapsed_time <= $frequency_interval
     ) {
       throw new \Exception(__('Sending frequency limit has been reached.'));
     }
     if($elapsed_time > $frequency_interval) {
-      $mta_log = array(
+      $this->mta_log = array(
         'sent' => 0,
         'started' => time()
       );
-      Setting::setValue('mta_log', $mta_log);
+      Setting::setValue('mta_log', $this->mta_log);
     }
-    return;
   }
 }
\ No newline at end of file
diff --git a/lib/Cron/Workers/SendingQueue/Tasks/Newsletter.php b/lib/Cron/Workers/SendingQueue/Tasks/Newsletter.php
index 92e827bad3..da22e508b0 100644
--- a/lib/Cron/Workers/SendingQueue/Tasks/Newsletter.php
+++ b/lib/Cron/Workers/SendingQueue/Tasks/Newsletter.php
@@ -14,13 +14,21 @@ use MailPoet\Util\Helpers;
 if(!defined('ABSPATH')) exit;
 
 class Newsletter {
-  static function get($newsletter_id) {
+  public $tracking_enabled;
+  public $tracking_image_inserted;
+
+  function __construct() {
+    $this->tracking_enabled = (boolean) Setting::getValue('tracking.enabled');
+    $this->tracking_image_inserted = false;
+  }
+
+  function get($newsletter_id) {
     $newsletter = NewsletterModel::findOne($newsletter_id);
     return ($newsletter) ? $newsletter->asArray() : false;
   }
 
-  static function getAndPreProcess(array $queue) {
-    $newsletter = self::get($queue['newsletter_id']);
+  function getAndPreProcess(array $queue) {
+    $newsletter = $this->get($queue['newsletter_id']);
     if(!$newsletter) {
       return false;
     }
@@ -31,16 +39,18 @@ class Newsletter {
       return $newsletter;
     }
     // if tracking is enabled, do additional processing
-    if((boolean) Setting::getValue('tracking.enabled')) {
-      // add tracking image
-      OpenTracking::addTrackingImage();
+    if($this->tracking_enabled) {
+      // hook once to the newsletter post-processing filter and add tracking image
+      if(!$this->tracking_image_inserted) {
+        $this->tracking_image_inserted = OpenTracking::addTrackingImage();
+      }
       // render newsletter
-      $newsletter = self::render($newsletter);
+      $newsletter = $this->render($newsletter);
       // hash and save all links
       $newsletter = LinksTask::process($newsletter, $queue);
     } else {
       // render newsletter
-      $newsletter = self::render($newsletter);
+      $newsletter = $this->render($newsletter);
     }
     // check if this is a post notification and if it contains posts
     $newsletter_contains_posts = strpos($newsletter['rendered_body']['html'], 'data-post-id');
@@ -52,13 +62,13 @@ class Newsletter {
     return $newsletter;
   }
 
-  static function render($newsletter) {
+  function render($newsletter) {
     $renderer = new Renderer($newsletter);
     $newsletter['rendered_body'] = $renderer->render();
     return $newsletter;
   }
 
-  static function prepareNewsletterForSending(
+  function prepareNewsletterForSending(
     array $newsletter, array $subscriber, array $queue
   ) {
     // shortcodes and links will be replaced in the subject, html and text body
@@ -76,7 +86,7 @@ class Newsletter {
       $subscriber,
       $queue
     );
-    if((boolean) Setting::getValue('tracking.enabled')) {
+    if($this->tracking_enabled) {
       $prepared_newsletter = NewsletterLinks::replaceSubscriberData(
         $newsletter['id'],
         $subscriber['id'],
diff --git a/lib/Cron/Workers/SendingQueue/Tasks/Statistics.php b/lib/Cron/Workers/SendingQueue/Tasks/Statistics.php
deleted file mode 100644
index 92e6b6d8ad..0000000000
--- a/lib/Cron/Workers/SendingQueue/Tasks/Statistics.php
+++ /dev/null
@@ -1,28 +0,0 @@
-<?php
-namespace MailPoet\Cron\Workers\SendingQueue\Tasks;
-
-use MailPoet\Models\StatisticsNewsletters;
-use MailPoet\Util\Helpers;
-
-if(!defined('ABSPATH')) exit;
-
-class Statistics {
-  static function processAndLogBulkNewsletterStatistics(
-    array $processed_subscribers_ids, $newsletter_id, $queue_id
-  ) {
-    $newsletter_statistics = array();
-    foreach($processed_subscribers_ids as $subscriber_id) {
-      $newsletter_statistics[] = array(
-        $newsletter_id,
-        $subscriber_id,
-        $queue_id
-      );
-    }
-    $newsletter_statistics = Helpers::flattenArray($newsletter_statistics);
-    return self::logStatistics($newsletter_statistics);
-  }
-
-  static function logStatistics($newsletter_statistics) {
-    return StatisticsNewsletters::createMultiple($newsletter_statistics);
-  }
-}
\ No newline at end of file
diff --git a/lib/Cron/Workers/SendingQueue/Tasks/Subscribers.php b/lib/Cron/Workers/SendingQueue/Tasks/Subscribers.php
index 6f9c74cb67..baa5488eec 100644
--- a/lib/Cron/Workers/SendingQueue/Tasks/Subscribers.php
+++ b/lib/Cron/Workers/SendingQueue/Tasks/Subscribers.php
@@ -4,8 +4,8 @@ namespace MailPoet\Cron\Workers\SendingQueue\Tasks;
 if(!defined('ABSPATH')) exit;
 
 class Subscribers {
-  static function get(array $queue) {
-    $subscribers = unserialize($queue['subscribers']);
+  static function get($subscribers) {
+    $subscribers = unserialize($subscribers);
     if(empty($subscribers['processed'])) {
       $subscribers['processed'] = array();
     }
@@ -41,8 +41,8 @@ class Subscribers {
       $failed_subscribers
     );
     $queue_subscribers['to_process'] = array_diff(
-      $failed_subscribers,
-      $queue_subscribers['to_process']
+      $queue_subscribers['to_process'],
+      $failed_subscribers
     );
     return $queue_subscribers;
   }
@@ -55,8 +55,8 @@ class Subscribers {
       $processed_subscribers
     );
     $queue_subscribers['to_process'] = array_diff(
-      $processed_subscribers,
-      $queue_subscribers['to_process']
+      $queue_subscribers['to_process'],
+      $processed_subscribers
     );
     return $queue_subscribers;
   }
diff --git a/lib/Newsletter/Links/Links.php b/lib/Newsletter/Links/Links.php
index b2a548ad93..754a8611ff 100644
--- a/lib/Newsletter/Links/Links.php
+++ b/lib/Newsletter/Links/Links.php
@@ -49,7 +49,7 @@ class Links {
         );
       }
     }
-    return Helpers::arrayUnique($extracted_links);
+    return array_unique($extracted_links, SORT_REGULAR);
   }
 
   static function process($content) {
diff --git a/lib/Newsletter/Renderer/PostProcess/OpenTracking.php b/lib/Newsletter/Renderer/PostProcess/OpenTracking.php
index 780939969e..92dc3b007d 100644
--- a/lib/Newsletter/Renderer/PostProcess/OpenTracking.php
+++ b/lib/Newsletter/Renderer/PostProcess/OpenTracking.php
@@ -2,10 +2,9 @@
 namespace MailPoet\Newsletter\Renderer\PostProcess;
 
 use MailPoet\Newsletter\Links\Links;
+use MailPoet\Newsletter\Renderer\Renderer;
 
 class OpenTracking {
-  const OPEN_TRACKING_FILTER_NAME = 'mailpoet_rendering_post_process';
-
   static function process($template) {
     $DOM = new \pQuery();
     $DOM = $DOM->parseStr($template);
@@ -20,11 +19,9 @@ class OpenTracking {
   }
 
   static function addTrackingImage() {
-    if(array_key_exists(self::OPEN_TRACKING_FILTER_NAME, $GLOBALS['wp_filter'])) {
-      return;
-    };
-    add_filter('mailpoet_rendering_post_process', function ($template) {
+    add_filter(Renderer::POST_PROCESS_FILTER, function ($template) {
       return OpenTracking::process($template);
     });
+    return true;
   }
 }
\ No newline at end of file
diff --git a/lib/Newsletter/Renderer/Renderer.php b/lib/Newsletter/Renderer/Renderer.php
index 397454cbef..66d4954612 100644
--- a/lib/Newsletter/Renderer/Renderer.php
+++ b/lib/Newsletter/Renderer/Renderer.php
@@ -10,6 +10,7 @@ class Renderer {
   public $CSS_inliner;
   public $newsletter;
   const NEWSLETTER_TEMPLATE = 'Template.html';
+  const POST_PROCESS_FILTER = 'mailpoet_rendering_post_process';
 
   function __construct(array $newsletter) {
     $this->newsletter = $newsletter;
@@ -102,7 +103,7 @@ class Renderer {
       str_replace('&', '&amp;', $template->html())
     );
     $template = apply_filters(
-      'mailpoet_rendering_post_process',
+      self::POST_PROCESS_FILTER,
       $DOM->__toString()
     );
     return $template;