From cd024bed8b8a8e7b2db32cc6b592eb46b321103d Mon Sep 17 00:00:00 2001
From: xiphon <xiphon@protonmail.com>
Date: Tue, 16 Oct 2018 18:32:38 +0000
Subject: [PATCH 1/2] tracking: query blockchain height only once during update

---
 pages/Receive.qml | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/pages/Receive.qml b/pages/Receive.qml
index 79b3e22b..1ccd49a1 100644
--- a/pages/Receive.qml
+++ b/pages/Receive.qml
@@ -80,7 +80,7 @@ Rectangle {
         var count = model.rowCount()
         var totalAmount = 0
         var nTransactions = 0
-        var blockchainHeight = 0
+        var blockchainHeight = null
         var txs = []
 
         for (var i = 0; i < count; ++i) {
@@ -103,8 +103,8 @@ Rectangle {
                 if (blockHeight == 0) {
                     in_txpool = true;
                 } else {
-                    if (blockchainHeight == 0)
-                        blockchainHeight = walletManager.blockchainHeight()
+                    if (blockchainHeight == null)
+                        blockchainHeight = appWindow.currentWallet.blockChainHeight()
                     confirmations = blockchainHeight - blockHeight - 1
                     displayAmount = model.data(idx, TransactionHistoryModel.TransactionDisplayAmountRole);
                 }

From cf8f36ba76bdf95eda38fc6de27ce889165c155a Mon Sep 17 00:00:00 2001
From: xiphon <xiphon@protonmail.com>
Date: Tue, 16 Oct 2018 18:37:48 +0000
Subject: [PATCH 2/2] tracking: don't fetch redundant txes

---
 pages/Receive.qml | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/pages/Receive.qml b/pages/Receive.qml
index 1ccd49a1..f8b22d71 100644
--- a/pages/Receive.qml
+++ b/pages/Receive.qml
@@ -65,6 +65,8 @@ Rectangle {
     }
 
     function update() {
+        const max_tracking = 3;
+
         if (!appWindow.currentWallet || !trackingEnabled.checked) {
             trackingLineText.text = "";
             trackingModel.clear();
@@ -83,7 +85,7 @@ Rectangle {
         var blockchainHeight = null
         var txs = []
 
-        for (var i = 0; i < count; ++i) {
+        for (var i = 0; i < count && txs.length < max_tracking; ++i) {
             var idx = model.index(i, 0)
             var isout = model.data(idx, TransactionHistoryModel.TransactionIsOutRole);
             var subaddrAccount = model.data(idx, TransactionHistoryModel.TransactionSubaddrAccountRole);
@@ -130,7 +132,6 @@ Rectangle {
             trackingLineText.text = qsTr("%1 transactions found").arg(nTransactions) + ":" + translationManager.emptyString
         }
 
-        var max_tracking = 3;
         toReceiveSatisfiedLine.text = "";
         var expectedAmount = walletManager.amountFromString(amountToReceiveLine.text)
         if (expectedAmount && expectedAmount != amount) {
@@ -143,11 +144,6 @@ Rectangle {
         }
 
         trackingModel.clear();
-
-        if (txs.length > 3) {
-            txs.length = 3;
-        }
-
         txs.forEach(function(tx){
             trackingModel.append({
                 "amount": tx.amount,