Dashboard calculations are done with an async job now

app/assets/javascripts/admin/controllers/admin_dashboard_controller.js

@@ -42,5 +42,9 @@ Discourse.AdminDashboardController = Ember.Controller.extend({
 
   problemsTimestamp: function() {
     return moment(this.get('problemsFetchedAt')).format('LLL');
-  }.property('problemsFetchedAt')
+  }.property('problemsFetchedAt'),
+
+  updatedTimestamp: function() {
+    return moment(this.get('updated_at')).format('LLL');
+  }.property('updated_at')
 });

app/assets/javascripts/admin/routes/admin_dashboard_route.js

@@ -14,7 +14,7 @@ Discourse.AdminDashboardRoute = Discourse.Route.extend({
   },
 
   fetchDashboardData: function(c) {
-    if( !c.get('dashboardFetchedAt') || moment().subtract('hour', 1).toDate() > c.get('dashboardFetchedAt') ) {
+    if( !c.get('dashboardFetchedAt') || moment().subtract('minutes', 30).toDate() > c.get('dashboardFetchedAt') ) {
       c.set('dashboardFetchedAt', new Date());
       Discourse.AdminDashboard.find().then(function(d) {
         if( Discourse.SiteSettings.version_checks ){
@@ -32,7 +32,7 @@ Discourse.AdminDashboardRoute = Discourse.Route.extend({
           c.set('top_referrers', topReferrers);
         }
 
-        ['admins', 'moderators', 'blocked', 'banned', 'top_traffic_sources', 'top_referred_topics'].forEach(function(x) {
+        ['admins', 'moderators', 'blocked', 'banned', 'top_traffic_sources', 'top_referred_topics', 'updated_at'].forEach(function(x) {
           c.set(x, d[x]);
         });
 

app/assets/javascripts/admin/templates/dashboard.js.handlebars

@@ -276,3 +276,9 @@
   </div>
 </div>
 <div class='clearfix'></div>
+
+<div class="dashboard-stats pull-right">
+  <div class="pull-right">{{i18n admin.dashboard.last_updated}} {{updatedTimestamp}}</div>
+  <div class='clearfix'></div>
+</div>
+<div class='clearfix'></div>