diff --git a/client/src/components/Game.vue b/client/src/components/Game.vue
index 87f50ef..e2ae49d 100644
--- a/client/src/components/Game.vue
+++ b/client/src/components/Game.vue
@@ -93,9 +93,10 @@ export default {
       this.context.stroke()
     },
     renderDebug (player) {
-      this.context.beginPath()
       const canvasX = this.canvas.width / 2
       const canvasY = this.canvas.height / 2
+      /*
+      this.context.beginPath()
       this.context.lineTo(canvasX, canvasY)
       this.context.lineTo(this.mouse.x, this.mouse.y)
       this.context.lineWidth = 1
@@ -111,12 +112,6 @@ export default {
       this.context.strokeStyle = 'yellow'
       this.context.stroke()
 
-      this.context.beginPath()
-      this.context.arc(this.mouse.x, this.mouse.y, 25, 0, 2 * Math.PI, false)
-      this.context.lineWidth = 1
-      this.context.strokeStyle = 'yellow'
-      this.context.stroke()
-
       const canvasX2 = this.canvas.width / 2
       const canvasY2 = this.canvas.height / 2
       this.context.beginPath()
@@ -124,11 +119,18 @@ export default {
       this.context.lineWidth = 1
       this.context.strokeStyle = 'purple'
       this.context.stroke()
+      */
 
       this.context.fillText('player x: ' + player.x + ' y:' + player.y, 10, 10)
       this.context.fillText('a:' + player.angle + ' a_t' + player.targetAngle, 10, 20)
       this.context.fillText('canvasX: ' + canvasX + ' canvasY:' + canvasY, 10, 30)
       this.context.fillText('walls: ' + player.walls.length, 10, 40)
+
+      this.context.beginPath()
+      this.context.arc(this.mouse.x, this.mouse.y, 25, 0, 2 * Math.PI, false)
+      this.context.lineWidth = 1
+      this.context.strokeStyle = player.color
+      this.context.stroke()
     },
     mouseEvent (event) {
       var rect = this.canvas.getBoundingClientRect()
diff --git a/server/src/main/java/gltronic/tronio/business/GameManager.java b/server/src/main/java/gltronic/tronio/business/GameManager.java
index 7dab49a..b70ee04 100644
--- a/server/src/main/java/gltronic/tronio/business/GameManager.java
+++ b/server/src/main/java/gltronic/tronio/business/GameManager.java
@@ -71,6 +71,9 @@ public class GameManager implements IGameManager {
       // COLLISIONS
       game.getPlayers().forEach((id2, player2) -> {
         for (var i = 0; i < player2.getWalls().size() - 2; i++) {
+          // Pour evité la collision avec un mur venant d'être placé par le même joueur
+          if (id.equals(id2) && i >= player2.getWalls().size() - 4) break;
+
           Wall wallA = player2.getWalls().get(i);
           Wall wallB = player2.getWalls().get(i + 1);
           if (isCloseToWall(wallA.getX(), wallA.getY(), wallB.getX(), wallB.getY(), player.getX(), player.getY(),
@@ -101,7 +104,11 @@ public class GameManager implements IGameManager {
       player.setY(player.getY() + game.getSettings().getPlayerSpeed() * Math.sin(player.getAngle()));
     });
 
-    SocketUtils.broadcast(game, "gameUpdate", new ObjectMapper().writeValueAsString(game.getPlayers().values()));
+    // Broadcast une fois sur deux
+    if (game.isUpdateNeeded()) {
+      SocketUtils.broadcast(game, "gameUpdate", new ObjectMapper().writeValueAsString(game.getPlayers().values()));
+      game.setUpdateNeeded(false);
+    } else game.setUpdateNeeded(true);
   }
 
   private void killPlayer(String id) {
@@ -127,11 +134,15 @@ public class GameManager implements IGameManager {
   }
 
   private boolean isCrossingLine (double xa, double ya, double xb, double yb, double xc, double yc, double radius) {
+    /*
     var a = xc - xa;
     var b = xb - xa;
     var c = yc - ya;
     var d = yb - ya;
     var result = (a * d - b * c) / Math.sqrt(Math.pow(xa - xb, 2) + Math.pow(ya - yb, 2));
+    */
+
+    var result = Math.abs((yb - ya) * xc - (xb - xa) * yc + xb * ya - yb * xa)/ Math.sqrt(Math.pow(xb - xa, 2) + Math.pow(yb - ya, 2));
 
     return result < radius;
   }
diff --git a/server/src/main/java/gltronic/tronio/model/Game.java b/server/src/main/java/gltronic/tronio/model/Game.java
index 174613a..9b6e17c 100644
--- a/server/src/main/java/gltronic/tronio/model/Game.java
+++ b/server/src/main/java/gltronic/tronio/model/Game.java
@@ -16,8 +16,10 @@ public class Game {
   private Map<String, Player> players;
   private Map<String, WebSocketSession> sessions;
   private GameSettings settings;
+  private boolean updateNeeded;
 
   public Game() {
+    this.updateNeeded = false;
     this.players = new HashMap<>();
     this.sessions = new HashMap<>();
     this.settings = new GameSettings();
diff --git a/server/target/classes/gltronic/tronio/business/GameManager.class b/server/target/classes/gltronic/tronio/business/GameManager.class
index 5202f6d..6644b40 100644
Binary files a/server/target/classes/gltronic/tronio/business/GameManager.class and b/server/target/classes/gltronic/tronio/business/GameManager.class differ
diff --git a/server/target/classes/gltronic/tronio/model/Game.class b/server/target/classes/gltronic/tronio/model/Game.class
index f42f641..f4e57ec 100644
Binary files a/server/target/classes/gltronic/tronio/model/Game.class and b/server/target/classes/gltronic/tronio/model/Game.class differ