PERF: don't run stats query in user card

app/assets/javascripts/discourse/controllers/user-card.js.es6

@@ -71,7 +71,7 @@ export default ObjectController.extend({
     this.setProperties({ user: null, userLoading: username, cardTarget: target });
 
     var self = this;
-    Discourse.User.findByUsername(username).then(function (user) {
+    Discourse.User.findByUsername(username, {stats: false}).then(function (user) {
       user = Discourse.User.create(user);
       self.setProperties({ user: user, avatar: user, visible: true});
       self.appEvents.trigger('usercard:shown');

app/assets/javascripts/discourse/models/user.js

@@ -292,11 +292,11 @@ Discourse.User = Discourse.Model.extend({
     return this.get('stats').rejectProperty('isPM');
   }.property('stats.@each.isPM'),
 
-  findDetails: function() {
+  findDetails: function(options) {
     var user = this;
 
     return PreloadStore.getAndRemove("user_" + user.get('username'), function() {
-      return Discourse.ajax("/users/" + user.get('username') + '.json');
+      return Discourse.ajax("/users/" + user.get('username') + '.json', {data: options});
     }).then(function (json) {
 
       if (!Em.isEmpty(json.user.stats)) {
@@ -468,9 +468,9 @@ Discourse.User.reopenClass(Discourse.Singleton, {
     @method findByUsername
     @returns {Promise} a promise that resolves to a `Discourse.User`
   **/
-  findByUsername: function(username) {
+  findByUsername: function(username, options) {
     var user = Discourse.User.create({username: username});
-    return user.findDetails();
+    return user.findDetails(options);
   },
 
   /**

app/controllers/users_controller.rb

@@ -28,6 +28,9 @@ class UsersController < ApplicationController
   def show
     @user = fetch_user_from_params
     user_serializer = UserSerializer.new(@user, scope: guardian, root: 'user')
+    if params[:stats].to_s == "false"
+      user_serializer.omit_stats = true
+    end
     respond_to do |format|
       format.html do
         @restrict_fields = guardian.restrict_user_fields?(@user)

app/serializers/user_serializer.rb

@@ -1,5 +1,7 @@
 class UserSerializer < BasicUserSerializer
 
+  attr_accessor :omit_stats
+
   def self.staff_attributes(*attrs)
     attributes(*attrs)
     attrs.each do |attr|
@@ -171,6 +173,10 @@ class UserSerializer < BasicUserSerializer
     scope.can_edit_name?(object)
   end
 
+  def include_stats?
+    !omit_stats == true
+  end
+
   def stats
     UserAction.stats(object.id, scope)
   end