use an array of profiles rather than a looping cursor for profile lists

classes/Profile.php

@@ -98,7 +98,7 @@ class Profile extends Managed_DataObject
         return $this->_user;
     }
 
-	protected $_avatars = array();
+	protected $_avatars;
 	
     function getAvatar($width, $height=null)
     {
@@ -106,6 +106,10 @@ class Profile extends Managed_DataObject
             $height = $width;
         }
 
+        if (!isset($this->_avatars)) {
+            $this->_avatars = array();
+        }
+
 		if (array_key_exists($width, $this->_avatars)) {
 			return $this->_avatars[$width];
 		}