Index: includes/path.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/path.inc,v
retrieving revision 1.19.2.1
diff -u -p -r1.19.2.1 path.inc
--- includes/path.inc	13 Oct 2008 21:06:41 -0000	1.19.2.1
+++ includes/path.inc	7 Jun 2009 10:47:12 -0000
@@ -217,9 +217,15 @@ function drupal_set_title($title = NULL)
  *   Boolean value: TRUE if the current page is the front page; FALSE if otherwise.
  */
 function drupal_is_front_page() {
-  // As drupal_init_path updates $_GET['q'] with the 'site_frontpage' path,
-  // we can check it against the 'site_frontpage' variable.
-  return $_GET['q'] == drupal_get_normal_path(variable_get('site_frontpage', 'node'));
+  static $is_front_page;
+
+  if (!isset($is_front_page)) {
+    // As drupal_init_path updates $_GET['q'] with the 'site_frontpage' path,
+    // we can check it against the 'site_frontpage' variable.
+    $is_front_page = ($_GET['q'] == drupal_get_normal_path(variable_get('site_frontpage', 'node')));
+  }
+
+  return $is_front_page;
 }
 
 /**