Turn off file locking when using the default Zend_Cache_File ticket cache. It...

Turn off file locking when using the default Zend_Cache_File ticket cache.  It has poor performance and doesn't even support NFS.

library/Unl/Cas.php

@@ -323,7 +323,8 @@ class Unl_Cas
                 'automatic_serialization' => TRUE
             );
             $backendOptions = array(
-                'cache_dir' => $cache_dir
+                'cache_dir' => $cache_dir,
+                'file_locking' => FALSE
             );
             $this->_ticketCache = Zend_Cache::factory('Core', 'File', $frontendOptions, $backendOptions);
         }