diff --git a/f8/app.cc b/f8/app.cc
index 2cda953..619ce03 100644
--- a/f8/app.cc
+++ b/f8/app.cc
@@ -234,18 +234,11 @@ namespace f8
             has_task = user_app_->HasTask();
         }
         if (!has_task) {
-#if 0
-            int sleep_time = 1;
-            loop_cond_->wait_for(lk, std::chrono::milliseconds(sleep_time));
-#else
             int sleep_time = f8::Timer::Instance()->GetIdleTime();
             loop_cond_->wait_for(lk, std::chrono::milliseconds(sleep_time));
-            #if 0
-            if (sleep_time > perf.max_timer_idle) {
-                perf.max_timer_idle = sleep_time;
-            }
-            #endif
-#endif
+        } else {
+            int sleep_time = 1;
+            loop_cond_->wait_for(lk, std::chrono::milliseconds(sleep_time));
         }
     }