Cache connection access.

activerecord/lib/active_record/log_subscriber.rb

@@ -6,6 +6,7 @@ def initialize
     end
 
     def sql(event)
+      connection = ActiveRecord::Base.connection
       connection.runtime += event.duration
       return unless logger.debug?
 
@@ -26,10 +27,6 @@ def odd?
       @odd_or_even = !@odd_or_even
     end
 
-    def connection
-      ActiveRecord::Base.connection
-    end
-
     def logger
       ActiveRecord::Base.logger
     end

activerecord/lib/active_record/railties/controller_runtime.rb

@@ -11,9 +11,10 @@ module ControllerRuntime
 
       def cleanup_view_runtime
         if ActiveRecord::Base.connected?
-          db_rt_before_render = ActiveRecord::Base.connection.reset_runtime
+          connection = ActiveRecord::Base.connection
+          db_rt_before_render = connection.reset_runtime
           runtime = super
-          db_rt_after_render = ActiveRecord::Base.connection.reset_runtime
+          db_rt_after_render = connection.reset_runtime
           self.db_runtime = db_rt_before_render + db_rt_after_render
           runtime - db_rt_after_render
         else