[RSS Feed/News] Question on sending alerts

[XenForo]

I have an article add-on and I am trying to add a feature to alert all users via XF and Push anytime a new article is posted. The code successfully sends alerts but is unable to finish my 20K+ user count. My article ends up not saving as _postSave never completes. How can I process these alerts more efficiently?

PHP:

 protected function _postSave()
 {

     if ($this->isInsert())
     {

         $extra = [
             'title' => $this->title,
             'article_id' => $this->article_id...

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