diff --git a/dev.html b/dev.html
index 650cf45a6b..9aa2fc79af 100644
--- a/dev.html
+++ b/dev.html
@@ -70,24 +70,26 @@
             var store = BI.useStore(function () {
                 return BI.Models.getModel("demo.model");
             });
-            setInterval(function () {
-                store.toggle();
-            }, 1000);
+            // setInterval(function () {
+            //     store.toggle();
+            // }, 1000);
             return function () {
                 return {
                     type: "bi.vertical",
                     vgap: 20,
-                    items: [{
-                        type: "demo.child"
-                    }, {
-                        type: "demo.child"
-                    }]
+                    items: BI.makeArray(10000).map(function (i) {
+                        return {
+                            type: "bi.label",
+                            text: i
+                        };
+                    })
                 };
             };
         }
     });
     BI.shortcut("demo.parent", Widget);
-    BI.createWidget({
+    var time = performance.now();
+    var widget = BI.createWidget({
         type: "bi.absolute",
         items: [{
             el: {
@@ -97,7 +99,10 @@
             left: 100
         }],
         element: "#wrapper"
+        // root: true
     });
+    // widget.element.appendTo("#wrapper");
+    console.log(performance.now() - time);
 </script>
 </body>
 </html>
diff --git a/src/core/widget.js b/src/core/widget.js
index f8844ef282..7b6b341f9a 100644
--- a/src/core/widget.js
+++ b/src/core/widget.js
@@ -227,22 +227,36 @@
          * @private
          */
         _mount: function (force, deep, lifeHook, predicate) {
+            if (this.__beforeMount(force, deep, lifeHook, predicate)) {
+                this.__afterMount(lifeHook, predicate);
+                return true;
+            }
+            return false;
+        },
+
+        __beforeMount: function (force, deep, lifeHook, predicate) {
             var self = this;
             if (!force && (this._isMounted || !this.isVisible() || this.__asking === true || !(this._isRoot === true || (this._parent && this._parent._isMounted === true)))) {
                 return false;
             }
             lifeHook !== false && callLifeHook(this, "beforeMount");
             this._isMounted = true;
-            this._mountChildren && this._mountChildren();
             BI.each(this._children, function (i, widget) {
                 !self.isEnabled() && widget._setEnable(false);
                 !self.isValid() && widget._setValid(false);
-                widget._mount && widget._mount(deep ? force : false, deep, lifeHook, predicate);
+                widget.__beforeMount && widget.__beforeMount(deep ? force : false, deep, lifeHook, predicate);
+            });
+            this._mountChildren && this._mountChildren();
+            return true;
+        },
+
+        __afterMount: function (lifeHook, predicate) {
+            BI.each(this._children, function (i, widget) {
+                widget.__afterMount && widget.__afterMount(lifeHook, predicate);
             });
             lifeHook !== false && callLifeHook(this, "mounted");
             this.fireEvent(BI.Events.MOUNT);
             predicate && predicate(this);
-            return true;
         },
 
         _mountChildren: null,