Our website (http://ventureouterzone) has been running very

Hello,

Our website (http://ventureouterzone) has been running very slow and was wondering if there are any suggestions to improve the performance. I've checked with the hosting and they indicated that public_html/wp-admin/admin-ajax.php is the cause of the slow performance. I'm a novice at wordpress and not sure what to do with this.

Thank you for your support,