diff --git a/retrace/retrace_main.cpp b/retrace/retrace_main.cpp
index 2c3ba9d..243bc46 100644
--- a/retrace/retrace_main.cpp
+++ b/retrace/retrace_main.cpp
@@ -583,6 +583,7 @@ RelayRace::stopRunners(void) {
     }
 }
 
+std::vector<trace::Call*>savedCalls;
 
 static void
 mainLoop() {
@@ -593,11 +594,36 @@ mainLoop() {
 
     startTime = os::getTime();
 
-    if (singleThread) {
+    if (1) //if (singleThread)
+    {
         trace::Call *call;
         while ((call = parser->parse_call())) {
             retraceCall(call);
-            delete call;
+            if (call->no >= 9359929 && call->no <= 9363932)
+            {
+                savedCalls.push_back(call);
+                if (call->no == 9363932)
+                {
+                    std::cout << "Replaying " << savedCalls.size() << " calls from last frame 5000 times\n";
+                    // Replay savedCalls 5000 times
+                    long long startTime, endTime;
+                    float timeInterval;
+                    for (int iter=0; iter<100; iter++)
+                        for (int i=0; i<savedCalls.size(); i++)
+                            retraceCall(savedCalls[i]);
+                    startTime= os::getTime();
+                    for (int iter=0; iter<5000; iter++)
+                        for (int i=0; i<savedCalls.size(); i++)
+                            retraceCall(savedCalls[i]);
+                    endTime= os::getTime();
+                    timeInterval = (endTime-startTime)*(1.0/os::timeFrequency);
+                    std::cout << "5000 replays of last frame completed\n";
+                    std::cout << "Time = " << timeInterval << " seconds\n";
+                    std::cout << "FPS = " << 5000.0/timeInterval << "\n";
+                    exit(0);
+                }
+            } else
+                delete call;
         }
     } else {
         RelayRace race;