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diff --git a/js/src/tests/js1_5/Array/regress-101964.js b/js/src/tests/js1_5/Array/regress-101964.js
new file mode 100644
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+++ b/js/src/tests/js1_5/Array/regress-101964.js
@@ -0,0 +1,86 @@
+// |reftest| random -- bogus perf test (bug 467263)
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+/*
+ * Date: 27 September 2001
+ *
+ * SUMMARY: Performance: truncating even very large arrays should be fast!
+ * See http://bugzilla.mozilla.org/show_bug.cgi?id=101964
+ *
+ * Adjust this testcase if necessary. The FAST constant defines
+ * an upper bound in milliseconds for any truncation to take.
+ */
+//-----------------------------------------------------------------------------
+var UBound = 0;
+var BUGNUMBER = 101964;
+var summary = 'Performance: truncating even very large arrays should be fast!';
+var BIG = 10000000;
+var LITTLE = 10;
+var FAST = 50; // array truncation should be 50 ms or less to pass the test
+var MSG_FAST = 'Truncation took less than ' + FAST + ' ms';
+var MSG_SLOW = 'Truncation took ';
+var MSG_MS = ' ms';
+var status = '';
+var statusitems = [];
+var actual = '';
+var actualvalues = [];
+var expect= '';
+var expectedvalues = [];
+
+
+
+status = inSection(1);
+var arr = Array(BIG);
+var start = new Date();
+arr.length = LITTLE;
+actual = elapsedTime(start);
+expect = FAST;
+addThis();
+
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+
+
+function elapsedTime(startTime)
+{
+  return new Date() - startTime;
+}
+
+
+function addThis()
+{
+  statusitems[UBound] = status;
+  actualvalues[UBound] = isThisFast(actual);
+  expectedvalues[UBound] = isThisFast(expect);
+  UBound++;
+}
+
+
+function isThisFast(ms)
+{
+  if (ms <= FAST)
+    return MSG_FAST;
+  return MSG_SLOW + ms + MSG_MS;
+}
+
+
+function test()
+{
+  enterFunc ('test');
+  printBugNumber(BUGNUMBER);
+  printStatus (summary);
+
+  for (var i=0; i<UBound; i++)
+  {
+    reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);
+  }
+
+  exitFunc ('test');
+}