Replaced fedora calls with regex to improve performance.

api/fedora_utils.inc

@@ -292,15 +292,15 @@ function get_content_models_as_option_array() {
     foreach ($list as $item) {   //removes  blanks
         if ($item) {
             $parts = explode(',', $item);
-      $item = new fedora_item($parts[0]);
             $nameparts = explode(':', $parts[0]);
-      if (!$restricted || in_array($nameparts[0], $allowed))
+            if (!$restricted || in_array($nameparts[0], $allowed)) {
-        $datastreams = array_keys($item->get_datastreams_list_as_array());
+
-      if (in_array('ISLANDORACM', $datastreams)) {
+                if (!preg_match('/fedora-system/', $nameparts[0])) {
                     $options[$parts[0]] = $parts[1] . ' ~ ' . $parts[0];
                 }
             }
         }
+    }
 
     return $options;
 }