diff --git a/battle_srv/models/room.go b/battle_srv/models/room.go
index 3778ada..3221f2e 100644
--- a/battle_srv/models/room.go
+++ b/battle_srv/models/room.go
@@ -158,6 +158,7 @@ type Room struct {
 	RenderFrameId                          int32
 	CurDynamicsRenderFrameId               int32 // [WARNING] The dynamics of backend is ALWAYS MOVING FORWARD BY ALL-CONFIRMED INPUTFRAMES (either by upsync or forced), i.e. no rollback
 	ServerFps                              int32
+	BattleDurationFrames                   int32
 	BattleDurationNanos                    int64
 	InputFrameUpsyncDelayTolerance         int32
 	MaxChasingRenderFramesPerUpdate        int32
@@ -175,6 +176,8 @@ type Room struct {
 	InputScaleFrames                       uint32 // inputDelayedAndScaledFrameId = ((originalFrameId - InputDelayFrames) >> InputScaleFrames)
 	JoinIndexBooleanArr                    []bool
 	RollbackEstimatedDt                    float64
+	RollbackEstimatedDtNanos               int64
+	LastRenderFrameIdTriggeredAt           int64
 
 	StageName                      string
 	StageDiscreteW                 int32
@@ -422,16 +425,22 @@ func (pR *Room) StartBattle() {
 			pR.onBattleStoppedForSettlement()
 		}()
 
-		battleMainLoopStartedNanos := utils.UnixtimeNano()
-		totalElapsedNanos := int64(0)
+		pR.LastRenderFrameIdTriggeredAt = utils.UnixtimeNano()
 
 		Logger.Info("The `battleMainLoop` is started for:", zap.Any("roomId", pR.Id))
 		for {
 			stCalculation := utils.UnixtimeNano()
 
-			if totalElapsedNanos > pR.BattleDurationNanos {
-				Logger.Info(fmt.Sprintf("The `battleMainLoop` for roomId=%v is stopped:\n%v", pR.Id, pR.InputsBufferString(true)))
+			elapsedNanosSinceLastFrameIdTriggered := stCalculation - pR.LastRenderFrameIdTriggeredAt
+			if elapsedNanosSinceLastFrameIdTriggered < pR.RollbackEstimatedDtNanos {
+				Logger.Debug(fmt.Sprintf("Avoiding too fast frame@roomId=%v, renderFrameId=%v: elapsedNanosSinceLastFrameIdTriggered=%v", pR.Id, pR.RenderFrameId, elapsedNanosSinceLastFrameIdTriggered))
+                continue
+			}
+
+			if pR.RenderFrameId > pR.BattleDurationFrames {
+				Logger.Info(fmt.Sprintf("The `battleMainLoop` for roomId=%v is stopped@renderFrameId=%v, with battleDurationFrames=%v:\n%v", pR.Id, pR.RenderFrameId, pR.BattleDurationFrames, pR.InputsBufferString(true)))
 				pR.StopBattleForSettlement()
+                return
 			}
 
 			if swapped := atomic.CompareAndSwapInt32(&pR.State, RoomBattleStateIns.IN_BATTLE, RoomBattleStateIns.IN_BATTLE); !swapped {
@@ -554,7 +563,6 @@ func (pR *Room) StartBattle() {
 
 			pR.RenderFrameId++
 			elapsedInCalculation := (utils.UnixtimeNano() - stCalculation)
-			totalElapsedNanos = (utils.UnixtimeNano() - battleMainLoopStartedNanos)
 			if elapsedInCalculation > nanosPerFrame {
 				Logger.Warn(fmt.Sprintf("SLOW FRAME! Elapsed time statistics: roomId=%v, room.RenderFrameId=%v, elapsedInCalculation=%v, dynamicsDuration=%v, nanosPerFrame=%v", pR.Id, pR.RenderFrameId, elapsedInCalculation, dynamicsDuration, nanosPerFrame))
 			}
@@ -780,8 +788,10 @@ func (pR *Room) OnDismissed() {
 	pR.NstDelayFrames = 8
 	pR.InputScaleFrames = uint32(2)
 	pR.ServerFps = 60
-	pR.RollbackEstimatedDt = float64(1.0) / float64(pR.ServerFps)
-	pR.BattleDurationNanos = int64(30 * 1000 * 1000 * 1000)
+	pR.RollbackEstimatedDt = 0.016667      // Use fixed-and-low-precision to mitigate the inconsistent floating-point-number issue between Golang and JavaScript
+	pR.RollbackEstimatedDtNanos = 16666666 // A little smaller than the actual per frame time, just for preventing FAST FRAME
+	pR.BattleDurationFrames = 30 * pR.ServerFps
+	pR.BattleDurationNanos = int64(pR.BattleDurationFrames) * (pR.RollbackEstimatedDtNanos + 1)
 	pR.InputFrameUpsyncDelayTolerance = 2
 	pR.MaxChasingRenderFramesPerUpdate = 10
 
@@ -945,12 +955,12 @@ func (pR *Room) OnPlayerBattleColliderAcked(playerId int32) bool {
 	// Broadcast added or readded player info to all players in the same room
 	for _, eachPlayer := range pR.Players {
 		/*
-				   [WARNING]
-				   This `playerAckedFrame` is the first ever "RoomDownsyncFrame" for every "PersistentSessionClient on the frontend", and it goes right after each "BattleColliderInfo".
+					   [WARNING]
+					   This `playerAckedFrame` is the first ever "RoomDownsyncFrame" for every "PersistentSessionClient on the frontend", and it goes right after each "BattleColliderInfo".
 
-				   By making use of the sequential nature of each ws session, all later "RoomDownsyncFrame"s generated after `pRoom.StartBattle()` will be put behind this `playerAckedFrame`.
+					   By making use of the sequential nature of each ws session, all later "RoomDownsyncFrame"s generated after `pRoom.StartBattle()` will be put behind this `playerAckedFrame`.
 
-		           This function is triggered by an upsync message via WebSocket, thus downsync sending is also available by now.
+			           This function is triggered by an upsync message via WebSocket, thus downsync sending is also available by now.
 		*/
 		switch targetPlayer.BattleState {
 		case PlayerBattleStateIns.ADDED_PENDING_BATTLE_COLLIDER_ACK:
@@ -1134,20 +1144,18 @@ func (pR *Room) applyInputFrameDownsyncDynamics(fromRenderFrameId int32, toRende
 				dx := baseChange * float64(decodedInput[0])
 				dy := baseChange * float64(decodedInput[1])
 
-				/*
-					// The collision lib seems very slow at worst cases, omitting for now
-					collisionPlayerIndex := COLLISION_PLAYER_INDEX_PREFIX + joinIndex
-					playerCollider := pR.CollisionSysMap[collisionPlayerIndex]
-					if collision := playerCollider.Check(dx, dy, "Barrier"); collision != nil {
-						changeWithCollision := collision.ContactWithObject(collision.Objects[0])
-						dx = changeWithCollision.X()
-						dy = changeWithCollision.Y()
-					}
-					playerCollider.X += dx
-					playerCollider.Y += dy
-					// Update in "collision space"
-					playerCollider.Update()
-				*/
+				// The collision lib seems very slow at worst cases, omitting for now
+				collisionPlayerIndex := COLLISION_PLAYER_INDEX_PREFIX + joinIndex
+				playerCollider := pR.CollisionSysMap[collisionPlayerIndex]
+				if collision := playerCollider.Check(dx, dy, "Barrier"); collision != nil {
+					changeWithCollision := collision.ContactWithObject(collision.Objects[0])
+					dx = changeWithCollision.X()
+					dy = changeWithCollision.Y()
+				}
+				playerCollider.X += dx
+				playerCollider.Y += dy
+				// Update in "collision space"
+				playerCollider.Update()
 
 				player.Dir.Dx = decodedInput[0]
 				player.Dir.Dy = decodedInput[1]
@@ -1159,7 +1167,7 @@ func (pR *Room) applyInputFrameDownsyncDynamics(fromRenderFrameId int32, toRende
 		newRenderFrame := pb.RoomDownsyncFrame{
 			Id:             collisionSysRenderFrameId + 1,
 			Players:        toPbPlayers(pR.Players),
-			CountdownNanos: (pR.BattleDurationNanos - int64(collisionSysRenderFrameId)*int64(pR.RollbackEstimatedDt*1000000000)), // TODO: Make this number more synced with frontend!
+			CountdownNanos: (pR.BattleDurationNanos - int64(collisionSysRenderFrameId)*pR.RollbackEstimatedDtNanos), // TODO: Make this number more synced with frontend!
 		}
 		pR.RenderFrameBuffer.Put(&newRenderFrame)
 		pR.CurDynamicsRenderFrameId++
@@ -1210,5 +1218,10 @@ func (pR *Room) refreshColliders() {
 		barrierCollider := resolv.NewObject(barrier.Boundary.Anchor.X, barrier.Boundary.Anchor.Y, w, h, "Barrier")
 		barrierCollider.SetShape(barrierColliderShape)
 		space.Add(barrierCollider)
+		pR.printBarrier(barrierCollider)
 	}
 }
+
+func (pR *Room) printBarrier(barrierCollider *resolv.Object) {
+	Logger.Info(fmt.Sprintf("Barrier in roomId=%v: w=%v, h=%v, shape=%v", pR.Id, barrierCollider.W, barrierCollider.H, barrierCollider.Shape))
+}
diff --git a/battle_srv/pb_output/room_downsync_frame.pb.go b/battle_srv/pb_output/room_downsync_frame.pb.go
index 4eb7349..b809e0c 100644
--- a/battle_srv/pb_output/room_downsync_frame.pb.go
+++ b/battle_srv/pb_output/room_downsync_frame.pb.go
@@ -302,6 +302,7 @@ type BattleColliderInfo struct {
 	InputFrameUpsyncDelayTolerance  int32                     `protobuf:"varint,16,opt,name=inputFrameUpsyncDelayTolerance,proto3" json:"inputFrameUpsyncDelayTolerance,omitempty"`
 	MaxChasingRenderFramesPerUpdate int32                     `protobuf:"varint,17,opt,name=maxChasingRenderFramesPerUpdate,proto3" json:"maxChasingRenderFramesPerUpdate,omitempty"`
 	PlayerBattleState               int32                     `protobuf:"varint,18,opt,name=playerBattleState,proto3" json:"playerBattleState,omitempty"`
+	RollbackEstimatedDt             float64                   `protobuf:"fixed64,19,opt,name=rollbackEstimatedDt,proto3" json:"rollbackEstimatedDt,omitempty"`
 }
 
 func (x *BattleColliderInfo) Reset() {
@@ -462,6 +463,13 @@ func (x *BattleColliderInfo) GetPlayerBattleState() int32 {
 	return 0
 }
 
+func (x *BattleColliderInfo) GetRollbackEstimatedDt() float64 {
+	if x != nil {
+		return x.RollbackEstimatedDt
+	}
+	return 0
+}
+
 type Player struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1113,7 +1121,7 @@ var file_room_downsync_frame_proto_rawDesc = []byte{
 	0x18, 0x01, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x1a, 0x2e, 0x74, 0x72, 0x65, 0x61, 0x73, 0x75, 0x72,
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@@ -1172,129 +1180,132 @@ var file_room_downsync_frame_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/battle_srv/ws/serve.go b/battle_srv/ws/serve.go
index a6e398c..541f4ab 100644
--- a/battle_srv/ws/serve.go
+++ b/battle_srv/ws/serve.go
@@ -261,6 +261,7 @@ func Serve(c *gin.Context) {
 			InputFrameUpsyncDelayTolerance:  pRoom.InputFrameUpsyncDelayTolerance,
 			MaxChasingRenderFramesPerUpdate: pRoom.MaxChasingRenderFramesPerUpdate,
 			PlayerBattleState:               pThePlayer.BattleState, // For frontend to know whether it's rejoining
+			RollbackEstimatedDt:             pRoom.RollbackEstimatedDt,
 		}
 
 		resp := &pb.WsResp{
diff --git a/frontend/assets/resources/pbfiles/room_downsync_frame.proto b/frontend/assets/resources/pbfiles/room_downsync_frame.proto
index c2b41d8..a7b0acd 100644
--- a/frontend/assets/resources/pbfiles/room_downsync_frame.proto
+++ b/frontend/assets/resources/pbfiles/room_downsync_frame.proto
@@ -46,6 +46,7 @@ message BattleColliderInfo {
   int32 inputFrameUpsyncDelayTolerance = 16;  
   int32 maxChasingRenderFramesPerUpdate = 17;
   int32 playerBattleState = 18;
+  double rollbackEstimatedDt = 19;
 }
 
 message Player {
diff --git a/frontend/assets/scenes/login.fire b/frontend/assets/scenes/login.fire
index 76a6bfa..6324f99 100644
--- a/frontend/assets/scenes/login.fire
+++ b/frontend/assets/scenes/login.fire
@@ -440,7 +440,7 @@
       "array": [
         0,
         0,
-        216.50635094610968,
+        209.57814771583418,
         0,
         0,
         0,
diff --git a/frontend/assets/scripts/Map.js b/frontend/assets/scripts/Map.js
index 34aea87..d3de835 100644
--- a/frontend/assets/scripts/Map.js
+++ b/frontend/assets/scripts/Map.js
@@ -410,11 +410,12 @@ cc.Class({
     /** Init required prefab ended. */
 
     window.handleBattleColliderInfo = function(parsedBattleColliderInfo) {
+      console.log("Colliders=", parsedBattleColliderInfo);
       self.inputDelayFrames = parsedBattleColliderInfo.inputDelayFrames;
       self.inputScaleFrames = parsedBattleColliderInfo.inputScaleFrames;
       self.inputFrameUpsyncDelayTolerance = parsedBattleColliderInfo.inputFrameUpsyncDelayTolerance;
 
-      self.rollbackEstimatedDt = 1.0 / parsedBattleColliderInfo.serverFps;
+      self.rollbackEstimatedDt = parsedBattleColliderInfo.rollbackEstimatedDt;
       self.rollbackEstimatedDtMillis = 1000.0 * self.rollbackEstimatedDt;
       self.rollbackEstimatedDtToleranceMillis = self.rollbackEstimatedDtMillis / 1000.0;
       self.maxChasingRenderFramesPerUpdate = parsedBattleColliderInfo.maxChasingRenderFramesPerUpdate;
diff --git a/frontend/assets/scripts/modules/room_downsync_frame_proto_bundle.forcemsg.js b/frontend/assets/scripts/modules/room_downsync_frame_proto_bundle.forcemsg.js
index e236559..2c97abc 100644
--- a/frontend/assets/scripts/modules/room_downsync_frame_proto_bundle.forcemsg.js
+++ b/frontend/assets/scripts/modules/room_downsync_frame_proto_bundle.forcemsg.js
@@ -1197,6 +1197,7 @@ $root.treasurehunterx = (function() {
          * @property {number|null} [inputFrameUpsyncDelayTolerance] BattleColliderInfo inputFrameUpsyncDelayTolerance
          * @property {number|null} [maxChasingRenderFramesPerUpdate] BattleColliderInfo maxChasingRenderFramesPerUpdate
          * @property {number|null} [playerBattleState] BattleColliderInfo playerBattleState
+         * @property {number|null} [rollbackEstimatedDt] BattleColliderInfo rollbackEstimatedDt
          */
 
         /**
@@ -1360,6 +1361,14 @@ $root.treasurehunterx = (function() {
          */
         BattleColliderInfo.prototype.playerBattleState = 0;
 
+        /**
+         * BattleColliderInfo rollbackEstimatedDt.
+         * @member {number} rollbackEstimatedDt
+         * @memberof treasurehunterx.BattleColliderInfo
+         * @instance
+         */
+        BattleColliderInfo.prototype.rollbackEstimatedDt = 0;
+
         /**
          * Creates a new BattleColliderInfo instance using the specified properties.
          * @function create
@@ -1426,6 +1435,8 @@ $root.treasurehunterx = (function() {
                 writer.uint32(/* id 17, wireType 0 =*/136).int32(message.maxChasingRenderFramesPerUpdate);
             if (message.playerBattleState != null && Object.hasOwnProperty.call(message, "playerBattleState"))
                 writer.uint32(/* id 18, wireType 0 =*/144).int32(message.playerBattleState);
+            if (message.rollbackEstimatedDt != null && Object.hasOwnProperty.call(message, "rollbackEstimatedDt"))
+                writer.uint32(/* id 19, wireType 1 =*/153).double(message.rollbackEstimatedDt);
             return writer;
         };
 
@@ -1570,6 +1581,10 @@ $root.treasurehunterx = (function() {
                         message.playerBattleState = reader.int32();
                         break;
                     }
+                case 19: {
+                        message.rollbackEstimatedDt = reader.double();
+                        break;
+                    }
                 default:
                     reader.skipType(tag & 7);
                     break;
@@ -1673,6 +1688,9 @@ $root.treasurehunterx = (function() {
             if (message.playerBattleState != null && message.hasOwnProperty("playerBattleState"))
                 if (!$util.isInteger(message.playerBattleState))
                     return "playerBattleState: integer expected";
+            if (message.rollbackEstimatedDt != null && message.hasOwnProperty("rollbackEstimatedDt"))
+                if (typeof message.rollbackEstimatedDt !== "number")
+                    return "rollbackEstimatedDt: number expected";
             return null;
         };
 
@@ -1747,6 +1765,8 @@ $root.treasurehunterx = (function() {
                 message.maxChasingRenderFramesPerUpdate = object.maxChasingRenderFramesPerUpdate | 0;
             if (object.playerBattleState != null)
                 message.playerBattleState = object.playerBattleState | 0;
+            if (object.rollbackEstimatedDt != null)
+                message.rollbackEstimatedDt = Number(object.rollbackEstimatedDt);
             return message;
         };
 
@@ -1788,6 +1808,7 @@ $root.treasurehunterx = (function() {
                 object.inputFrameUpsyncDelayTolerance = 0;
                 object.maxChasingRenderFramesPerUpdate = 0;
                 object.playerBattleState = 0;
+                object.rollbackEstimatedDt = 0;
             }
             if (message.stageName != null && message.hasOwnProperty("stageName"))
                 object.stageName = message.stageName;
@@ -1835,6 +1856,8 @@ $root.treasurehunterx = (function() {
                 object.maxChasingRenderFramesPerUpdate = message.maxChasingRenderFramesPerUpdate;
             if (message.playerBattleState != null && message.hasOwnProperty("playerBattleState"))
                 object.playerBattleState = message.playerBattleState;
+            if (message.rollbackEstimatedDt != null && message.hasOwnProperty("rollbackEstimatedDt"))
+                object.rollbackEstimatedDt = options.json && !isFinite(message.rollbackEstimatedDt) ? String(message.rollbackEstimatedDt) : message.rollbackEstimatedDt;
             return object;
         };