// Small backend optimization

classes/Employee.php

@@ -243,13 +243,16 @@ class EmployeeCore extends ObjectModel
 	  * @return boolean employee validity
 	  */
 	public function isLoggedBack()
+	{
+		if (!Cache::isStored('isLoggedBack'.$this->id))
 		{
 			/* Employee is valid only if it can be load and if cookie password is the same as database one */
-	 	return ($this->id
+			Cache::store('isLoggedBack'.$this->id, (
-			&& Validate::isUnsignedId($this->id)
+				$this->id && Validate::isUnsignedId($this->id) && Employee::checkPassword($this->id, $this->passwd)
-			&& Employee::checkPassword($this->id, $this->passwd)
 				&& (!isset($this->remote_addr) || $this->remote_addr == ip2long(Tools::getRemoteAddr()) || !Configuration::get('PS_COOKIE_CHECKIP'))
-		);
+			));
+		}
+		return Cache::retrieve('isLoggedBack'.$this->id);
 	}
 
 	/**

classes/Tab.php

@@ -169,12 +169,18 @@ class TabCore extends ObjectModel
 	 */
 	public static function getCurrentParentId()
 	{
-	 	if ($result = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow('
+		$cache_id = 'getCurrentParentId_'.Tools::strtolower(Tools::getValue('controller'));
+		if (!Cache::isStored($cache_id))
+		{
+			$value = Db::getInstance(_PS_USE_SQL_SLAVE_)->getValue('
 			SELECT `id_parent`
 			FROM `'._DB_PREFIX_.'tab`
-	 		WHERE LOWER(class_name) = \''.pSQL(Tools::strtolower(Tools::getValue('controller'))).'\''))
+			WHERE LOWER(class_name) = \''.pSQL(Tools::strtolower(Tools::getValue('controller'))).'\'');
-		 	return $result['id_parent'];
+			if (!$value)
- 		return -1;
+				$value = -1;
+			Cache::store($cache_id, $value);
+		}
+		return Cache::retrieve($cache_id);
 	}
 
 	/**