=== modified file 'modules/node/node.module'
--- modules/node/node.module	2010-08-11 21:05:18 +0000
+++ modules/node/node.module	2010-11-12 06:56:33 +0000
 function node_access($op, $node, $account = NULL) {
   global $user;
+  static $rights = array();
 
   if (!$node || !in_array($op, array('view', 'update', 'delete', 'create'), TRUE)) {
     // If there was no node to check against, or the $op was not one of the
@@ -2018,16 +2058,24 @@
   if (empty($account)) {
     $account = $user;
   }
+
+  // Return cached value if it exists.
+  if (isset($node->nid) && isset($rights[$account->uid][$node->nid][$op])) {
+    return $rights[$account->uid][$node->nid][$op];
+  }
   // If the node is in a restricted format, disallow editing.
   if ($op == 'update' && !filter_access($node->format)) {
+    $rights[$account->uid][$node->nid][$op] = FALSE;
     return FALSE;
   }
 
   if (user_access('administer nodes', $account)) {
+    $rights[$account->uid][$node->nid][$op] = TRUE;
     return TRUE;
   }
 
   if (!user_access('access content', $account)) {
+    $rights[$account->uid][$node->nid][$op] = FALSE;
     return FALSE;
   }
 
@@ -2039,6 +2087,9 @@
   }
   $access = module_invoke($module, 'access', $op, $node, $account);
   if (!is_null($access)) {
+    if (isset($node->nid)) {
+      $rights[$account->uid][$node->nid][$op] = $access;
+    }
     return $access;
   }
 
@@ -2059,11 +2110,13 @@
 
     $sql = "SELECT 1 FROM {node_access} WHERE (nid = 0 OR nid = %d) $grants_sql AND grant_$op >= 1";
     $result = db_query_range($sql, $node->nid, 0, 1);
-    return (bool) db_result($result);
+    $rights[$account->uid][$node->nid][$op] = (bool) db_result($result);
+    return $rights[$account->uid][$node->nid][$op];
   }
 
   // Let authors view their own nodes.
   if ($op == 'view' && $account->uid == $node->uid && $account->uid != 0) {
+    $rights[$account->uid][$node->nid][$op] = TRUE;
     return TRUE;
   }