diff --git a/f8/app.cc b/f8/app.cc
index a5c8790..bf382fa 100644
--- a/f8/app.cc
+++ b/f8/app.cc
@@ -86,11 +86,11 @@ namespace f8
                 f8::MsgQueue::Instance()->Update();
                 DispatchNetMsg();
                 user_app->Update(delta_time);
-                Schedule();
                 a8::tick_t end_tick = a8::XGetTickCount();
-                //if (end_tick - begin_tick > PerfMonitor::Instance()->max_run_delay_time) {
-                //PerfMonitor::Instance()->max_run_delay_time = end_tick - begin_tick;
-                //}
+                if (end_tick - begin_tick > max_run_delay_time_) {
+                    max_run_delay_time_ = end_tick - begin_tick;
+                }
+                Schedule();
                 delta_time = end_tick - begin_tick;
             }
             UnInit();
diff --git a/f8/app.h b/f8/app.h
index 020899b..e142c01 100644
--- a/f8/app.h
+++ b/f8/app.h
@@ -61,6 +61,8 @@ namespace f8
         int GetArgc() { return argc_; }
         long long GetMsgNodeSize() { return msgnode_size_; }
         long long GetWorkingMsgNodeSize() { return working_msgnode_size_; }
+        long long GetMaxRunDelayTime() { return max_run_delay_time_; }
+        void ResetMaxRunDelayTime() { max_run_delay_time_ = 0; }
 
     private:
         bool Init();
@@ -78,6 +80,7 @@ namespace f8
         int exit_code_ = 0;
         volatile bool terminated_ = false;
         int nowtime_ = 0;
+        long long max_run_delay_time_ = 0;
 
         int zone_id_ = 0;
         int node_id_ = 0;