diff --git a/benchmark/web/bp.js b/benchmark/web/bp.js
index 518ef2999..dc48360c7 100644
--- a/benchmark/web/bp.js
+++ b/benchmark/web/bp.js
@@ -133,12 +133,13 @@ bp.Runner.runTimedTest = function (bs) {
   if (typeof window.gc === 'function') {
     window.gc();
   }
+  var memory = performance.memory ? performance.memory : {usedJSHeapSize: NaN};
 
-  beforeHeap = performance.memory.usedJSHeapSize;
+  beforeHeap = memory.usedJSHeapSize;
   startTime = bp.Measure.numMilliseconds();
   bs.fn();
   endTime = bp.Measure.numMilliseconds() - startTime;
-  afterHeap = performance.memory.usedJSHeapSize;
+  afterHeap = memory.usedJSHeapSize;
 
   startGCTime = bp.Measure.numMilliseconds();
   if (typeof window.gc === 'function') {
@@ -146,7 +147,7 @@ bp.Runner.runTimedTest = function (bs) {
   }
   endGCTime = bp.Measure.numMilliseconds() - startGCTime;
 
-  finalHeap = performance.memory.usedJSHeapSize;
+  finalHeap = memory.usedJSHeapSize;
   garbage = Math.abs(finalHeap - afterHeap);
   retainedMemory = finalHeap - beforeHeap;
   return {
diff --git a/benchmark/web/transcluding-tree-tmpl.html b/benchmark/web/transcluding-tree-tmpl.html
new file mode 100644
index 000000000..cd5423a9c
--- /dev/null
+++ b/benchmark/web/transcluding-tree-tmpl.html
@@ -0,0 +1,4 @@
+<span> {{ctrl.data.value}}
+   <span ng-if="ctrl.data.right != null"><transcluding-tree-url data=ctrl.data.right></span>
+   <span ng-if="ctrl.data.left != null"><transcluding-tree-url data=ctrl.data.left></span>
+</span>
diff --git a/benchmark/web/tree.dart b/benchmark/web/tree.dart
index 2710b73f7..332f94141 100644
--- a/benchmark/web/tree.dart
+++ b/benchmark/web/tree.dart
@@ -14,21 +14,41 @@ import 'dart:js' as js;
     '<span ng-if="ctrl.data.right != null"><tree data=ctrl.data.right></span>'
     '<span ng-if="ctrl.data.left != null"><tree data=ctrl.data.left></span>'
     '</span>',
-    publishAs: 'ctrl')
+    publishAs: 'ctrl',
+    useShadowDom: true)
 class TreeComponent {
   @NgOneWay('data')
   var data;
 }
 
+@Component(
+    selector: 'transcluding-tree',
+    template: '<span> {{ctrl.data.value}}'
+    '<span ng-if="ctrl.data.right != null"><transcluding-tree data=ctrl.data.right></span>'
+    '<span ng-if="ctrl.data.left != null"><transcluding-tree data=ctrl.data.left></span>'
+    '</span>',
+    publishAs: 'ctrl',
+    useShadowDom: false)
+class TranscludingTreeComponent extends TreeComponent {}
+  
+
 @Component(
     selector: 'tree-url',
     templateUrl: 'tree-tmpl.html',
-    publishAs: 'ctrl')
+    publishAs: 'ctrl',
+    useShadowDom: true)
 class TreeUrlComponent {
   @NgOneWay('data')
   var data;
 }
 
+@Component(
+    selector: 'transcluding-tree-url',
+    templateUrl: 'transcluding-tree-tmpl.html',
+    publishAs: 'ctrl',
+    useShadowDom: false)
+class TranscludingTreeUrlComponent extends TreeUrlComponent {}
+
 
 // This is a baseline implementation of TreeComponent.
 // It assumes the data never changes and simply throws elements on the DOM
@@ -250,7 +270,9 @@ main() {
 
   var module = new Module()
       ..bind(TreeComponent)
+      ..bind(TranscludingTreeComponent)
       ..bind(TreeUrlComponent)
+      ..bind(TranscludingTreeUrlComponent)
       ..bind(NgFreeTree)
       ..bind(NgFreeTreeScoped)
       ..bind(NgFreeTreeClass)
diff --git a/benchmark/web/tree.html b/benchmark/web/tree.html
index e245db00e..46bfe7bf7 100644
--- a/benchmark/web/tree.html
+++ b/benchmark/web/tree.html
@@ -1,6 +1,11 @@
 <html>
 <head>
    <title>TreeComponent Benchmark</title>
+
+    <!-- Uncomment to test in Firefox -->
+    <!--<script src="packages/web_components/platform.js"></script>-->
+    <!--<script src="packages/web_components/dart_support.js"></script>-->
+
     <script src="underscore.js"></script>
     <script src="bp.js"></script>
     <script src="tree.dart" type="application/dart"></script>
@@ -129,14 +134,18 @@
     </p>
 
     <div>Default: <input type=checkbox ng-model="useDefault"></div>
+    <div>Transcluding: <input type=checkbox ng-model="useTranscluding"></div>
     <div>From URL: <input type=checkbox ng-model="useUrl"></div>
+    <div>Transcluding from URL: <input type=checkbox ng-model="useTranscludingFromUrl"></div>
     <div>Baseline: <input type=checkbox ng-model="useBaseline"></div>
     <div>Baseline + scope: <input type=checkbox ng-model="useBaselineScoped"></div>
     <div>Baseline + class: <input type=checkbox ng-model="useBaselineClass"></div>
 
 
     <tree ng-if="useDefault" data=initData></tree>
+    <transcluding-tree ng-if="useTranscluding" data=initData></transcluding-tree>
     <tree-url ng-if="useUrl" data=initData></tree-url>
+    <transcluding-tree-url ng-if="useTranscludingFromUrl" data=initData></transcluding-tree-url>
 
     <ng-free-tree ng-if="useBaseline" data=initData></ng-free-tree>
     <ng-free-tree-scoped ng-if="useBaselineScoped" data=initData></ng-free-tree-scoped>
