diff --git a/graphenej/src/main/java/cy/agorise/graphenej/network/LatencyNodeProvider.java b/graphenej/src/main/java/cy/agorise/graphenej/network/LatencyNodeProvider.java
index 8531936..92bf2c5 100644
--- a/graphenej/src/main/java/cy/agorise/graphenej/network/LatencyNodeProvider.java
+++ b/graphenej/src/main/java/cy/agorise/graphenej/network/LatencyNodeProvider.java
@@ -2,18 +2,15 @@ package cy.agorise.graphenej.network;
 
 import java.util.ArrayList;
 import java.util.Collections;
-import java.util.HashSet;
 import java.util.List;
-import java.util.PriorityQueue;
+import java.util.concurrent.PriorityBlockingQueue;
 
 public class LatencyNodeProvider implements NodeProvider {
-    private HashSet<String> mRemovedNodeURLs;
 
-    private PriorityQueue<FullNode> mFullNodeHeap;
+    private PriorityBlockingQueue<FullNode> mFullNodeHeap;
 
     public LatencyNodeProvider(){
-        mFullNodeHeap = new PriorityQueue<>();
-        mRemovedNodeURLs = new HashSet<>();
+        mFullNodeHeap = new PriorityBlockingQueue<>();
     }
 
     @Override
@@ -24,13 +21,12 @@ public class LatencyNodeProvider implements NodeProvider {
     @Override
     public void addNode(FullNode fullNode) {
         mFullNodeHeap.add(fullNode);
-        mRemovedNodeURLs.remove(fullNode.getUrl());
     }
 
     @Override
     public boolean updateNode(FullNode fullNode) {
-        if (!mRemovedNodeURLs.contains(fullNode.getUrl())) {
-            mFullNodeHeap.remove(fullNode);
+        boolean existed = mFullNodeHeap.remove(fullNode);
+        if(existed){
             return mFullNodeHeap.offer(fullNode);
         }
         return false;
@@ -44,19 +40,16 @@ public class LatencyNodeProvider implements NodeProvider {
      * @return          True if the node priority was updated successfully
      */
     public boolean updateNode(FullNode fullNode, int latency){
-        if(!mRemovedNodeURLs.contains(fullNode.getUrl()) && mFullNodeHeap.remove(fullNode)){
-            fullNode.addLatencyValue(latency);
+        boolean existed = mFullNodeHeap.remove(fullNode);
+        if(existed){
             return mFullNodeHeap.add(fullNode);
-        }else{
-            return false;
         }
+        return false;
     }
 
     @Override
     public void removeNode(FullNode fullNode) {
-        if (mFullNodeHeap.remove(fullNode)) {
-            mRemovedNodeURLs.add(fullNode.getUrl());
-        }
+        mFullNodeHeap.remove(fullNode);
     }
 
     @Override