Magento performance: getSortedAttributes caching

gistfile1.txt

Core optimization I:

Test:

  url: http://myproject.com.local/ (a catalog page that loads 111 products)

  Before:
    Total Incl. Wall Time (microsec): 34,340,233 microsecs
    Number of Function Calls: 10,098,542

  After:
    Total Incl. Wall Time (microsec): 16,672,205 microsecs
    Number of Function Calls: 3,944,652

Code:

# create a copy of Mage_Eav_Model_Entity_Abstract in pool local
install -D web/app/code/core/Mage/Eav/Model/Entity/Abstract.php web/app/code/local/Mage/Eav/Model/Entity/Abstract.php

# add to class attributes:
protected static $_sortedAttributesBySetId = array();

# rename method getSortedAttributes to _getSortedAttributes

# add method getSortedAttributes:

public function getSortedAttributes($setId = null)
{
  if (key_exists($setId, self::$_sortedAttributesBySetId)) {
    $sortedAttributes = self::$_sortedAttributesBySetId[ $setId ];    
  }
  else {
    $sortedAttributes = $this->_getSortedAttributes($setId);
    self::$_sortedAttributesBySetId[ $setId ] = $sortedAttributes;  
  }
  return $sortedAttributes;
}