diff --git a/tools/playground/samples.js b/tools/playground/samples.js
index 21f8ce54..46fc333b 100644
--- a/tools/playground/samples.js
+++ b/tools/playground/samples.js
@@ -1573,6 +1573,191 @@ class Root extends Component {
 mount(Root, document.body, { templates: TEMPLATES, dev: true});
 `;
 
+const BENCHMARK_JS = `
+const { Component, mount, xml, useState, onWillRender, onPatched} = owl;
+
+// -----------------------------------------------------------------------------
+// Data generation
+// -----------------------------------------------------------------------------
+
+let idCounter = 1;
+const adjectives = [
+    "pretty", "large", "big", "small", "tall", "short", "long", "handsome", "plain",
+    "quaint", "clean", "elegant", "easy", "angry", "crazy", "helpful", "mushy", "odd",
+    "unsightly", "adorable", "important", "inexpensive", "cheap", "expensive", "fancy"];
+const colours = ["red", "yellow", "blue", "green", "pink", "brown", "purple", "brown", "white", "black", "orange"];
+const nouns = ["table", "chair", "house", "bbq", "desk", "car", "pony", "cookie", "sandwich", "burger", "pizza", "mouse", "keyboard"];
+
+function _random (max) { return Math.round(Math.random() * 1000) % max; };
+
+function buildData(count) {
+    const data = new Array(count);
+    for (let i = 0; i < count; i++) {
+        const label = \`\${adjectives[_random(adjectives.length)]} \${colours[_random(colours.length)]} \${nouns[_random(nouns.length)]}\`;
+        data[i] = {
+            id: idCounter++,
+            label,
+        };
+    }
+    return data;
+}
+
+// -----------------------------------------------------------------------------
+// Components
+// -----------------------------------------------------------------------------
+class Button extends Component {
+  static template = xml\`
+      <div class='col-sm-6 smallpad'>
+          <button t-att-id="props.id" class='btn btn-primary btn-block' type='button' t-on-click="props.onClick">
+              <t t-esc="props.text"/>
+          </button>
+      </div>\`;
+}
+
+
+class Row extends Component {
+  static template = xml\`
+      <tr t-att-class="props.isSelected ? 'danger' : ''">
+          <td class="col-md-1" t-esc="props.row.id" />
+          <td class="col-md-4">
+              <a t-on-click="() => props.onSelect(props.row.id)" t-esc="props.row.label" />
+          </td>
+          <td class="col-md-1">
+              <a t-on-click="() =>  props.onRemove(props.row.id)" class="remove">[x]
+                <span class='glyphicon glyphicon-remove' aria-hidden="true" />
+              </a>
+          </td>
+          <td class='col-md-6'/>
+      </tr>\`
+}
+
+class Root extends Component {
+  static template = xml\`
+      <div class='container'>
+        <div class='jumbotron'>
+          <div class='row'>
+            <div class='col-md-6'>
+              <h1>Owl Keyed</h1>
+            </div>
+            <div class='col-md-6'>
+              <div class='row'>
+                <Button id="'run'" onClick.bind="run" text="'Create 1,000 rows'" />
+                <Button id="'runlots'" onClick.bind="runLots" text="'Create 10,000 rows'" />
+                <Button id="'add'" onClick.bind="add" text="'Append 1,000 rows'" />
+                <Button id="'update'" onClick.bind="update" text="'Update every 10th row'" />
+                <Button id="'clear'" onClick.bind="clear" text="'Clear'" />
+                <Button id="'swaprows'" onClick.bind="swapRows" text="'Swap Rows'" />
+              </div>
+            </div>
+          </div>
+        </div>
+        <table class='table table-hover table-striped test-data'>
+          <tbody>
+            <t t-foreach="state.rows" t-as="row" t-key="row.id">
+                <Row row="row" isSelected="row.id === state.selectedRowId" onSelect.bind="selectRow" onRemove.bind="removeRow"/>
+            </t>
+          </tbody>
+        </table>
+        <span class='preloadicon glyphicon glyphicon-remove' aria-hidden="true" />
+      </div>\`;
+
+  static components = { Button, Row };
+
+  setup() {
+      this.state = useState({
+          rows: [],
+          selectedRowId: null
+      });
+      this.benchmarking = false;
+      onPatched(() => {
+          if (this.benchmarking) {
+              this.stop();
+          }
+      });
+    }
+    
+    start(descr) {
+        this.benchmarking = \`[\${descr}]\`;
+        console.time(this.benchmarking);
+    }
+    stop() {
+        console.timeEnd(this.benchmarking);
+        this.benchmarking = false;  
+    }
+
+    run() {
+        this.start('add1000');
+        this.state.rows = buildData(1000);
+        this.state.selectedRowId = null;
+    }
+    
+    runLots() {
+        this.start('add10_000');
+        this.state.rows = buildData(10_000);
+        this.state.selectedRowId = null;
+    }
+    
+    add() {
+        this.start('append1000');
+        this.state.rows = this.state.rows.concat(buildData(1000));
+    }
+    
+    update() {
+        this.start('update1/10th');
+        let index = 0;
+        const rows = this.state.rows;
+        while (index < rows.length) {
+            rows[index].label = rows[index].label + " !!!";
+            index += 10;
+        }
+    }
+    
+    clear() {
+        this.start('clear');
+        this.state.rows = [];
+        this.state.selectedRowId = null;
+    }
+    
+    swapRows() {
+        this.start('swap');
+        const rows = this.state.rows;
+        if (rows.length > 998) {
+            let tmp = rows[1];
+            rows[1] = rows[998];
+            rows[998] = tmp;
+        }
+    }
+    
+    selectRow(id) {
+        this.start('select');
+        this.state.selectedRowId = id;
+    }
+    
+    removeRow(id) {
+        this.start('remove1');
+        const rows = this.state.rows;
+        rows.splice(rows.findIndex(row => row.id === id), 1);
+    }
+}
+
+
+mount(Root, document.body, { templates: TEMPLATES, dev: true });
+
+`;
+
+const BENCHMARK_CSS =  `
+tr.danger {
+  font-weight: bold;
+}
+
+.remove:hover {
+  font-weight: bold;
+}
+.remove {
+  cursor: pointer;
+}
+`;
+
 export const SAMPLES = [
   {
     description: "Components",
@@ -1625,4 +1810,9 @@ export const SAMPLES = [
     xml: WMS_XML,
     css: WMS_CSS,
   },
+  {
+    description: "Benchmark example",
+    code: BENCHMARK_JS,
+    css: BENCHMARK_CSS,
+  },
 ];