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Open up classes/Notification.php, and locate the getLastElements method:

	public function getLastElements()
	{
		global $cookie;

		$notifications = array();

		$employee_infos = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow('
		SELECT id_last_order, id_last_customer_message, id_last_customer
		FROM `'._DB_PREFIX_.'employee`
		WHERE `id_employee` = '.(int)$cookie->id_employee);

		foreach ($this->types as $type)
			$notifications[$type] = Notification::getLastElementsIdsByType($type, $employee_infos['id_last_'.$type]);

		return $notifications;
	}

Modify as follows

	public function getLastElements()
	{
		global $cookie;

		$notifications = array();

		foreach($this->types as $type)
			$notifications[$type] = array();

		return $notifications;

		$employee_infos = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow('
		SELECT id_last_order, id_last_customer_message, id_last_customer
		FROM `'._DB_PREFIX_.'employee`
		WHERE `id_employee` = '.(int)$cookie->id_employee);

		foreach ($this->types as $type)
			$notifications[$type] = Notification::getLastElementsIdsByType($type, $employee_infos['id_last_'.$type]);

		return $notifications;
	}

This way, we are effectively saving lots of resources as we don’t query the database for new items.

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