diff --git a/lib/default.php b/lib/default.php
index 71b2257cd5b6e1107bf8e57b678c1b9f42435f18..8748b645804f282f6c607fe2acb0c65b386b131e 100644
--- a/lib/default.php
+++ b/lib/default.php
@@ -351,5 +351,6 @@ $default =
         'router' =>
         array('cache' => true), // whether to cache the router object. Defaults to true, turn off for devel
         'discovery' =>
-        array('cors' => false) // Allow Cross-Origin Resource Sharing for service discovery (host-meta, XRD, etc.)
+          array('cors' => false), // Allow Cross-Origin Resource Sharing for service discovery (host-meta, XRD, etc.)
+        'performance' => array('high' => false) // disable some features for higher performance; default false
     );