diff --git a/README.md b/README.md
index 82dd5a0..d0ff78b 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ _(in game screenshot)_
 
 ![screenshot-1](./charts/screenshot-1.png)
 
-Please checkout [this demo video](https://pan.baidu.com/s/123LlWcT9X-wbcYybqYnvmA?pwd=qrlw) to see whether the source codes are doing what you expect for synchronization.
+Please checkout [this demo video](https://pan.baidu.com/s/1YkfuHjNLzlFVnKiEj6wrDQ?pwd=tkr5) to see whether the source codes are doing what you expect for synchronization.
 
 The video mainly shows the following features.
 - The backend receives inputs from frontend peers and [by a GGPO-alike manner](https://github.com/pond3r/ggpo/blob/master/doc/README.md) broadcasts back for synchronization.
diff --git a/battle_srv/models/room.go b/battle_srv/models/room.go
index 936f2a5..8259456 100644
--- a/battle_srv/models/room.go
+++ b/battle_srv/models/room.go
@@ -790,9 +790,9 @@ func (pR *Room) Dismiss() {
 func (pR *Room) OnDismissed() {
 
 	// Always instantiates new HeapRAM blocks and let the old blocks die out due to not being retained by any root reference.
-	pR.WorldToVirtualGridRatio = float64(10)
+	pR.WorldToVirtualGridRatio = float64(1000)
 	pR.VirtualGridToWorldRatio = float64(1.0) / pR.WorldToVirtualGridRatio // this is a one-off computation, should avoid division in iterations
-	pR.PlayerDefaultSpeed = 20                                             // Hardcoded in virtual grids per frame
+	pR.PlayerDefaultSpeed = int32(float64(2) * pR.WorldToVirtualGridRatio) // in virtual grids per frame
 	pR.Players = make(map[int32]*Player)
 	pR.PlayersArr = make([]*Player, pR.Capacity)
 	pR.CollisionSysMap = make(map[int32]*resolv.Object)
diff --git a/battle_srv/ws/serve.go b/battle_srv/ws/serve.go
index 9d7b0f9..c45d3cd 100644
--- a/battle_srv/ws/serve.go
+++ b/battle_srv/ws/serve.go
@@ -16,6 +16,7 @@ import (
 	"time"
 
 	. "dnmshared"
+	"runtime/debug"
 )
 
 const (
@@ -104,7 +105,7 @@ func Serve(c *gin.Context) {
 		}
 		defer func() {
 			if r := recover(); r != nil {
-				Logger.Warn("Recovered from: ", zap.Any("panic", r))
+				Logger.Error("Recovered from: ", zap.Any("panic", r))
 			}
 		}()
 		/**
@@ -356,7 +357,7 @@ func Serve(c *gin.Context) {
 	receivingLoopAgainstPlayer := func() error {
 		defer func() {
 			if r := recover(); r != nil {
-				Logger.Warn("Goroutine `receivingLoopAgainstPlayer`, recovery spot#1, recovered from: ", zap.Any("panic", r))
+				Logger.Error("Goroutine `receivingLoopAgainstPlayer`, recovery spot#1, recovered from: ", zap.Any("panic", r), zap.Any("callstack", debug.Stack()))
 			}
 			Logger.Info("Goroutine `receivingLoopAgainstPlayer` is stopped for:", zap.Any("playerId", playerId), zap.Any("roomId", pRoom.Id))
 		}()
diff --git a/frontend/assets/scripts/Map.js b/frontend/assets/scripts/Map.js
index 6d7deb2..e3bdf00 100644
--- a/frontend/assets/scripts/Map.js
+++ b/frontend/assets/scripts/Map.js
@@ -352,7 +352,7 @@ cc.Class({
     window.mapIns = self;
     window.forceBigEndianFloatingNumDecoding = self.forceBigEndianFloatingNumDecoding;
 
-    self.showCriticalCoordinateLabels = true;
+    self.showCriticalCoordinateLabels = false;
 
     console.warn("+++++++ Map onLoad()");
     window.handleClientSessionError = function() {
diff --git a/frontend/assets/scripts/SelfPlayer.js b/frontend/assets/scripts/SelfPlayer.js
index 33ab8cf..a726ecc 100644
--- a/frontend/assets/scripts/SelfPlayer.js
+++ b/frontend/assets/scripts/SelfPlayer.js
@@ -30,6 +30,10 @@ cc.Class({
       '2-1': 'attackedRight'
     };
     this.arrowTipNode.active = false;
+
+    if (!this.mapIns.showCriticalCoordinateLabels) {
+      this.coordLabel.node.active = false;
+    }
   },
 
   showArrowTipNode() {