Improve efficiency of attribute configuration.

polymer.html

@@ -77,10 +77,10 @@
       this._setupDebouncers();
       // concretize effects on instance
       this._marshalInstanceEffects();
-      // install host attributes
-      this._marshalHostAttributes();
       // acquire instance behaviors
       this._marshalBehaviors();
+      // install host attributes
+      this._marshalHostAttributes();
       // acquire initial instance attribute values
       this._marshalAttributes();
       // top-down initial distribution, configuration, & ready callback

src/micro/attributes.html

@@ -81,7 +81,13 @@
         // since shimming classes would make it work
         // inconsisently under native SD
         if (!this.hasAttribute(n) && (n !== 'class')) {
-          this.serializeValueToAttribute(attr$[n], n, this);
+          var v = attr$[n];
+          this.serializeValueToAttribute(v, n, this);
+          // if necessary, add this value to configuration...
+          if (!this._clientsReady && this._propertyInfo[n] &&
+            (this._config[n] === undefined)) {
+            this._config[n] = v;
+          }
         }
       }
     },
@@ -91,10 +97,12 @@
     },
 
     _takeAttributesToModel: function(model) {
-      for (var i in this._propertyInfo) {
-        var info = this._propertyInfo[i];
-        if (this.hasAttribute(info.attribute)) {
-          this._setAttributeToProperty(model, info.attribute, i, info);
+      if (this.hasAttributes()) {
+        for (var i in this._propertyInfo) {
+          var info = this._propertyInfo[i];
+          if (this.hasAttribute(info.attribute)) {
+            this._setAttributeToProperty(model, info.attribute, i, info);
+          }
         }
       }
     },