Instead of removing every currently loaded chunk of the world from the players's PlayerChunkSendQueue individually, I could just clear it. It's just a clean up operation anyway, whichs purpose is to help the garbage collector a little bit

Author: Poweruser

src/main/java/net/minecraft/server/PlayerChunkMap.java

@@ -267,14 +267,12 @@ public void removePlayer(EntityPlayer entityplayer) {
             PlayerChunk c = (PlayerChunk) i.next();
             if(c != null) {
                 c.b(entityplayer);
-                ChunkCoordIntPair ccip = PlayerChunk.a(c);
-                PlayerChunkSendQueue pcsq = entityplayer.chunkQueue;
-                if(pcsq != null) {
-                    pcsq.removeFromServer(ccip.x, ccip.z);
-                    pcsq.removeFromClient(ccip);
-                }
             }
         }
+        PlayerChunkSendQueue pcsq = entityplayer.chunkQueue;
+        if(pcsq != null) {
+            pcsq.clear();
+        }
         entityplayer.setPlayerChunkSendQueue(null);
         this.playerChunkManager.removePlayer(entityplayer);
         // Poweruser end