PERF: Rendering crawler's template is expensive.

app/controllers/about_controller.rb

@@ -9,8 +9,6 @@ class AboutController < ApplicationController
 
     respond_to do |format|
       format.html do
-        # @list = list
-        # store_preloaded(list.preload_key, MultiJson.dump(TopicListSerializer.new(list, scope: guardian)))
         render :index
       end
       format.json do

app/helpers/application_helper.rb

@@ -169,8 +169,12 @@ module ApplicationHelper
     MobileDetection.resolve_mobile_view!(request.user_agent,params,session)
   end
 
+  def crawler_layout?
+    controller.try(:use_crawler_layout?)
+  end
+
   def include_crawler_content?
-    controller.try(:use_crawler_layout?) || !mobile_view?
+    crawler_layout? || !mobile_view?
   end
 
   def mobile_device?

app/views/about/index.html.erb

@@ -1,3 +1,5 @@
+<% if crawler_layout? %>
+
 <% content_for :title do %><%=t "about" %><% end %>
 
 <section itemscope itemtype="https://schema.org/AboutPage">
@@ -52,6 +54,8 @@
     </div>
   <% end %>
 
+  <%- stats = About.fetch_cached_stats %>
+
   <section class='about stats'>
     <h2><%=t 'js.about.stats' %></h2>
 
@@ -64,37 +68,39 @@
       </tr>
       <tr>
         <td class='title'><%=t 'js.about.topic_count' %></td>
-        <td><%= @about.stats[:topic_count] %></td>
+        <td><%= stats["topic_count"] %></td>
-        <td><%= @about.stats[:topics_7_days] %></td>
+        <td><%= stats["topics_7_days"] %></td>
-        <td><%= @about.stats[:topics_30_days] %></td>
+        <td><%= stats["topics_30_days"] %></td>
       </tr>
       <tr>
         <td><%=t 'js.about.post_count' %></td>
-        <td><%= @about.stats[:post_count] %></td>
+        <td><%= stats["post_count"] %></td>
-        <td><%= @about.stats[:posts_7_days] %></td>
+        <td><%= stats["posts_7_days"] %></td>
-        <td><%= @about.stats[:posts_30_days] %></td>
+        <td><%= stats["posts_30_days"] %></td>
       </tr>
       <tr>
         <td><%=t 'js.about.user_count' %></td>
-        <td><%= @about.stats[:user_count] %></td>
+        <td><%= stats["user_count"] %></td>
-        <td><%= @about.stats[:users_7_days] %></td>
+        <td><%= stats["users_7_days"] %></td>
-        <td><%= @about.stats[:users_30_days] %></td>
+        <td><%= stats["users_30_days"] %></td>
       </tr>
       <tr>
         <td><%=t 'js.about.active_user_count' %></td>
         <td>&mdash;</td>
-        <td><%= @about.stats[:active_users_7_days] %></td>
+        <td><%= stats["active_users_7_days"] %></td>
-        <td><%= @about.stats[:active_users_30_days] %></td>
+        <td><%= stats["active_users_30_days"] %></td>
       </tr>
       <tr>
         <td><%=t 'js.about.like_count' %></td>
-        <td><%= @about.stats[:like_count] %></td>
+        <td><%= stats["like_count"] %></td>
-        <td><%= @about.stats[:likes_7_days] %></td>
+        <td><%= stats["likes_7_days"] %></td>
-        <td><%= @about.stats[:likes_30_days] %></td>
+        <td><%= stats["likes_30_days"] %></td>
       </tr>
     </table>
   </section>
 
 </section>
 <br/>
-<br/>
+<br/>
+
+<% end %>