--- webform.module.orig	Fri Feb 27 23:35:15 2009
+++ webform.module	Sat Oct 10 12:32:16 2009
@@ -2099,6 +2110,7 @@
  */
 function _webform_filter_values($string, $node = NULL, $submission = NULL, $strict = TRUE) {
   global $user;
+  global $webform_uid_cached;
 
   // Setup default token replacements.
   $find = array('%site', '%date');
@@ -2123,8 +2135,9 @@
   $find[] = '%useremail';
   $replace[] = isset($user->name) ? $user->name : '';
   $replace[] = isset($user->mail) ? $user->mail : '';
-  if ($user->uid && module_exists('profile')) {
+  if ($user->uid && module_exists('profile') && $webform_uid_cached != $user->uid) {
     profile_load_profile($user);
+    $webform_uid_cached = $user->uid;
   }
 
   // Provide a list of candidates for token replacement.