diff --git a/frontend/assets/scripts/Map.js b/frontend/assets/scripts/Map.js
index 4e580e6..19b201c 100644
--- a/frontend/assets/scripts/Map.js
+++ b/frontend/assets/scripts/Map.js
@@ -894,8 +894,12 @@ cc.Class({
       }
     }
     self._markConfirmationIfApplicable();
+    self._handleIncorrectlyRenderedPrediction(firstPredictedYetIncorrectInputFrameId, batch, false);
+  },
 
+  _handleIncorrectlyRenderedPrediction(firstPredictedYetIncorrectInputFrameId, batch, fromUDP) {
     if (null == firstPredictedYetIncorrectInputFrameId) return;
+    const self = this;
     const renderFrameId1 = gopkgs.ConvertToFirstUsedRenderFrameId(firstPredictedYetIncorrectInputFrameId) - 1;
     if (renderFrameId1 >= self.chaserRenderFrameId) return;
 
@@ -911,12 +915,17 @@ cc.Class({
     --------------------------------------------------------
     */
     // The actual rollback-and-chase would later be executed in update(dt). 
-    console.log(`Mismatched input detected, resetting chaserRenderFrameId: ${self.chaserRenderFrameId}->${renderFrameId1} by firstPredictedYetIncorrectInputFrameId: ${firstPredictedYetIncorrectInputFrameId}
+    console.log(`Mismatched input detected, resetting chaserRenderFrameId: ${self.chaserRenderFrameId}->${renderFrameId1} by 
+firstPredictedYetIncorrectInputFrameId: ${firstPredictedYetIncorrectInputFrameId}
 lastAllConfirmedInputFrameId=${self.lastAllConfirmedInputFrameId}
 recentInputCache=${self._stringifyRecentInputCache(false)}
-batchInputFrameIdRange=[${batch[0].inputFrameId}, ${batch[batch.length - 1].inputFrameId}]`);
+batchInputFrameIdRange=[${batch[0].inputFrameId}, ${batch[batch.length - 1].inputFrameId}]
+fromUDP=${fromUDP}`);
     self.chaserRenderFrameId = renderFrameId1;
-    self.networkDoctor.logRollbackFrames(self.renderFrameId - self.chaserRenderFrameId);
+    let rollbackFrames = (self.renderFrameId - self.chaserRenderFrameId);
+    if (0 > rollbackFrames)
+      rollbackFrames = 0;
+    self.networkDoctor.logRollbackFrames(rollbackFrames);
   },
 
   onPeerInputFrameUpsync(peerJoinIndex, batch, fromUDP) {
@@ -935,12 +944,24 @@ batchInputFrameIdRange=[${batch[0].inputFrameId}, ${batch[batch.length - 1].inpu
 
     let effCnt = 0;
     //console.log(`Received peer inputFrameUpsync batch w/ inputFrameId in [${batch[0].inputFrameId}, ${batch[batch.length - 1].inputFrameId}] for prediction assistance`);
+    let firstPredictedYetIncorrectInputFrameId = null;
     const renderedInputFrameIdUpper = gopkgs.ConvertToDelayedInputFrameId(self.renderFrameId);
     for (let k in batch) {
       const inputFrame = batch[k]; // could be either "pb.InputFrameDownsync" or "pb.InputFrameUpsync", depending on "fromUDP"
       const inputFrameId = inputFrame.inputFrameId;
+      const peerEncodedInput = (true == fromUDP ? inputFrame.encoded : inputFrame.inputList[peerJoinIndex - 1]);
       if (inputFrameId <= renderedInputFrameIdUpper) {
         // [WARNING] Avoid obfuscating already rendered history, even at "inputFrameId == renderedInputFrameIdUpper", due to the use of "INPUT_SCALE_FRAMES" some previous render frames might already be rendered with "inputFrameId"!   
+        // TODO: Shall we update the "chaserRenderFrameId" if the rendered history was wrong? It doesn't seem to impact eventual correctness if we allow the update of "chaserRenderFrameId" upon "inputFrameId <= renderedInputFrameIdUpper" here, however UDP upsync doesn't reserve order from a same sender and there might be multiple other senders, hence it might result in unnecessarily frequent chasing.
+        const localInputFrame = self.recentInputCache.GetByFrameId(inputFrameId);
+        if (null != localInputFrame
+          &&
+          null == firstPredictedYetIncorrectInputFrameId
+          &&
+          localInputFrame.InputList[peerJoinIndex - 1] != peerEncodedInput
+        ) {
+          firstPredictedYetIncorrectInputFrameId = inputFrameId;
+        }
         continue;
       }
       if (inputFrameId <= self.lastAllConfirmedInputFrameId) {
@@ -953,7 +974,6 @@ batchInputFrameIdRange=[${batch[0].inputFrameId}, ${batch[batch.length - 1].inpu
       if (0 < (existingInputFrame.ConfirmedList & peerJoinIndexMask)) {
         continue;
       }
-      const peerEncodedInput = (true == fromUDP ? inputFrame.encoded : inputFrame.inputList[peerJoinIndex - 1]);
       if (inputFrameId > self.lastIndividuallyConfirmedInputFrameId[peerJoinIndex - 1]) {
         self.lastIndividuallyConfirmedInputFrameId[peerJoinIndex - 1] = inputFrameId;
         self.lastIndividuallyConfirmedInputList[peerJoinIndex - 1] = peerEncodedInput;
@@ -964,13 +984,14 @@ batchInputFrameIdRange=[${batch[0].inputFrameId}, ${batch[batch.length - 1].inpu
       newInputList[peerJoinIndex - 1] = peerEncodedInput;
       let newConfirmedList = (existingInputFrame.ConfirmedList | peerJoinIndex);
       const newInputFrameDownsyncLocal = gopkgs.NewInputFrameDownsync(inputFrameId, newInputList, newConfirmedList);
-      console.log(`Updated encoded input of peerJoinIndex=${peerJoinIndex} to ${peerEncodedInput} for inputFrameId=${inputFrameId}/renderedInputFrameIdUpper=${renderedInputFrameIdUpper} from ${JSON.stringify(inputFrame)}; newInputFrameDownsyncLocal=${self.gopkgsInputFrameDownsyncStr(newInputFrameDownsyncLocal)}; existingInputFrame=${self.gopkgsInputFrameDownsyncStr(existingInputFrame)}`);
+      //console.log(`Updated encoded input of peerJoinIndex=${peerJoinIndex} to ${peerEncodedInput} for inputFrameId=${inputFrameId}/renderedInputFrameIdUpper=${renderedInputFrameIdUpper} from ${JSON.stringify(inputFrame)}; newInputFrameDownsyncLocal=${self.gopkgsInputFrameDownsyncStr(newInputFrameDownsyncLocal)}; existingInputFrame=${self.gopkgsInputFrameDownsyncStr(existingInputFrame)}`);
       self.recentInputCache.SetByFrameId(newInputFrameDownsyncLocal, inputFrameId);
     }
     if (0 < effCnt) {
       //self._markConfirmationIfApplicable();
       self.networkDoctor.logPeerInputFrameUpsync(batch[0].inputFrameId, batch[batch.length - 1].inputFrameId);
     }
+    self._handleIncorrectlyRenderedPrediction(firstPredictedYetIncorrectInputFrameId, batch, fromUDP);
   },
 
   onPlayerAdded(rdf /* pb.RoomDownsyncFrame */ ) {
@@ -1115,7 +1136,7 @@ othersForcedDownsyncRenderFrame=${JSON.stringify(othersForcedDownsyncRenderFrame
         ++self.renderFrameId; // [WARNING] It's important to increment the renderFrameId AFTER all the operations above!!!
         self.lastRenderFrameIdTriggeredAt = performance.now();
         let t3 = performance.now();
-        self.skipRenderFrameFlag = self.networkDoctor.isTooFast();
+        self.skipRenderFrameFlag = self.networkDoctor.isTooFast(self);
       } catch (err) {
         console.error("Error during Map.update", err);
         self.onBattleStopped(); // TODO: Popup to ask player to refresh browser
diff --git a/frontend/assets/scripts/NetworkDoctor.js b/frontend/assets/scripts/NetworkDoctor.js
index 5b1f4e8..17affde 100644
--- a/frontend/assets/scripts/NetworkDoctor.js
+++ b/frontend/assets/scripts/NetworkDoctor.js
@@ -79,17 +79,29 @@ NetworkDoctor.prototype.logSkippedRenderFrameCnt = function() {
   this.skippedRenderFrameCnt += 1;
 }
 
-NetworkDoctor.prototype.isTooFast = function() {
-  return false;
+NetworkDoctor.prototype.isTooFast = function(mapIns) {
   const [sendingFps, srvDownsyncFps, peerUpsyncFps, rollbackFrames, skippedRenderFrameCnt] = this.stats();
-  if (sendingFps >= this.inputRateThreshold + 2) {
+  if (sendingFps >= this.inputRateThreshold + 3) {
     // Don't send too fast
+    console.log(`Sending too fast, sendingFps=${sendingFps}`);
     return true;
-  } else if (sendingFps >= this.inputRateThreshold && srvDownsyncFps >= this.inputRateThreshold) {
+  } else {
+    const sendingFpsNormal = (sendingFps >= this.inputRateThreshold);
     // An outstanding lag within the "inputFrameDownsyncQ" will reduce "srvDownsyncFps", HOWEVER, a constant lag wouldn't impact "srvDownsyncFps"! In native platforms we might use PING value might help as a supplement information to confirm that the "selfPlayer" is not lagged within the time accounted by "inputFrameDownsyncQ".  
-    if (rollbackFrames >= this.rollbackFramesThreshold) {
-      // I got many frames rolled back while none of my peers effectively helped my preciction. Deliberately not using "peerUpsyncThreshold" here because when using UDP p2p upsync broadcasting, we expect to receive effective p2p upsyncs from every other player.   
-      return true;
+    const recvFpsNormal = (srvDownsyncFps >= this.inputRateThreshold || peerUpsyncFps >= this.inputRateThreshold * (window.boundRoomCapacity - 1));
+    if (sendingFpsNormal && recvFpsNormal) {
+      let selfInputFrameIdFront = gopkgs.ConvertToNoDelayInputFrameId(mapIns.renderFrameId);
+      let minInputFrameIdFront = Number.MAX_VALUE;
+      for (let k = 0; k < window.boundRoomCapacity; ++k) {
+        if (k + 1 == mapIns.selfPlayerInfo.JoinIndex) continue;
+        if (mapIns.lastIndividuallyConfirmedInputFrameId[k] >= minInputFrameIdFront) continue;
+        minInputFrameIdFront = mapIns.lastIndividuallyConfirmedInputFrameId[k];
+      }
+      if ((selfInputFrameIdFront > minInputFrameIdFront) && ((selfInputFrameIdFront - minInputFrameIdFront) > (mapIns.inputFrameUpsyncDelayTolerance+2))) {
+        // first comparison condition is to avoid numeric overflow
+        console.log(`Game logic ticking too fast, selfInputFrameIdFront=${selfInputFrameIdFront}, minInputFrameIdFront=${minInputFrameIdFront}, inputFrameUpsyncDelayTolerance=${mapIns.inputFrameUpsyncDelayTolerance}`);
+        return true;
+      }
     }
   }
   return false;