diff --git a/f8/app.cc b/f8/app.cc
index 0153a66..f50f1ce 100644
--- a/f8/app.cc
+++ b/f8/app.cc
@@ -76,13 +76,20 @@ namespace f8
         argc_ = argc;
         argv_ = argv;
         user_app_ = user_app;
+        int delta_time = 0;
         if (Init()) {
             while (!Terminated()) {
+                a8::tick_t begin_tick = a8::XGetTickCount();
                 f8::Timer::Instance()->Update();
                 f8::MsgQueue::Instance()->Update();
                 DispatchNetMsg();
-                user_app->Update(0);
+                user_app->Update(delta_time);
+                a8::tick_t end_tick = a8::XGetTickCount();
                 Schedule();
+                //if (end_tick - begin_tick > PerfMonitor::Instance()->max_run_delay_time) {
+                //PerfMonitor::Instance()->max_run_delay_time = end_tick - begin_tick;
+                //}
+                delta_time = end_tick - begin_tick;
             }
             UnInit();
         }
@@ -240,6 +247,7 @@ namespace f8
             MsgHdr* hdr = list_first_entry(work_list, MsgHdr, entry);
             list_del_init(&hdr->entry);
             user_app_->DispatchSocketMsg(hdr);
+            MsgHdr::Destroy(hdr);
         }
     }
 
diff --git a/f8/protoutils.cc b/f8/protoutils.cc
index 8f354ea..09ecf96 100644
--- a/f8/protoutils.cc
+++ b/f8/protoutils.cc
@@ -306,20 +306,14 @@ namespace f8
 
     MsgHdr* MsgHdr::Clone()
     {
-        MsgHdr* hdr = (MsgHdr*)malloc(sizeof(MsgHdr));
-        *hdr = *this;
-        if (hdr->buflen > 0) {
-            hdr->buf = (char*)malloc(hdr->buflen);
-            memmove((void*)hdr->buf, (void*)buf, buflen);
-        }
+        MsgHdr* hdr = (MsgHdr*)malloc(sizeof(MsgHdr) + buflen);
+        memmove((void*)hdr, (void*)this, sizeof(MsgHdr) + buflen);
+        hdr->buf = ((char*)hdr) + sizeof(MsgHdr);
         return hdr;
     }
 
     void MsgHdr::Destroy(MsgHdr* hdr)
     {
-        if (hdr->buf) {
-            free((void*)hdr->buf);
-        }
         free((void*)hdr);
     }