diff --git a/src/net.cpp b/src/net.cpp
index b71c538862f5..5987b915f383 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -1239,9 +1239,9 @@ void CConnman::ThreadSocketHandler()
         {
             LOCK(cs_vNodes);
             // Disconnect unused nodes
-            std::vector<CNode*> vNodesCopy = vNodes;
-            for (CNode* pnode : vNodesCopy)
+            for (auto it = vNodes.begin(); it != vNodes.end(); )
             {
+                CNode* pnode = *it;
                 if (pnode->fDisconnect)
                 {
                     if (fLogIPs) {
@@ -1253,7 +1253,7 @@ void CConnman::ThreadSocketHandler()
                     }
 
                     // remove from vNodes
-                    vNodes.erase(remove(vNodes.begin(), vNodes.end(), pnode), vNodes.end());
+                    it = vNodes.erase(it);
 
                     // release outbound grant (if any)
                     pnode->grantOutbound.Release();
@@ -1265,17 +1265,20 @@ void CConnman::ThreadSocketHandler()
                     // hold in disconnected pool until all refs are released
                     pnode->Release();
                     vNodesDisconnected.push_back(pnode);
+                } else {
+                    ++it;
                 }
             }
         }
         {
             // Delete disconnected nodes
             std::list<CNode*> vNodesDisconnectedCopy = vNodesDisconnected;
-            for (CNode* pnode : vNodesDisconnectedCopy)
+            for (auto it = vNodesDisconnected.begin(); it != vNodesDisconnected.end(); )
             {
+                CNode* pnode = *it;
                 // wait until threads are done using it
+                bool fDelete = false;
                 if (pnode->GetRefCount() <= 0) {
-                    bool fDelete = false;
                     {
                         TRY_LOCK(pnode->cs_inventory, lockInv);
                         if (lockInv) {
@@ -1286,10 +1289,13 @@ void CConnman::ThreadSocketHandler()
                         }
                     }
                     if (fDelete) {
-                        vNodesDisconnected.remove(pnode);
+                        it = vNodesDisconnected.erase(it);
                         DeleteNode(pnode);
                     }
                 }
+                if (!fDelete) {
+                    ++it;
+                }
             }
         }
         size_t vNodesSize;
@@ -3413,6 +3419,7 @@ std::vector<CNode*> CConnman::CopyNodeVector(std::function<bool(const CNode* pno
 {
     std::vector<CNode*> vecNodesCopy;
     LOCK(cs_vNodes);
+    vecNodesCopy.reserve(vNodes.size());
     for(size_t i = 0; i < vNodes.size(); ++i) {
         CNode* pnode = vNodes[i];
         if (!cond(pnode))
@@ -3430,7 +3437,6 @@ std::vector<CNode*> CConnman::CopyNodeVector()
 
 void CConnman::ReleaseNodeVector(const std::vector<CNode*>& vecNodes)
 {
-    LOCK(cs_vNodes);
     for(size_t i = 0; i < vecNodes.size(); ++i) {
         CNode* pnode = vecNodes[i];
         pnode->Release();
diff --git a/src/net.h b/src/net.h
index 8e8f9edb9aae..25f14a55253c 100644
--- a/src/net.h
+++ b/src/net.h
@@ -770,7 +770,7 @@ class CNode
     size_t nSendSize; // total size of all vSendMsg entries
     size_t nSendOffset; // offset inside the first vSendMsg already sent
     uint64_t nSendBytes;
-    std::deque<std::vector<unsigned char>> vSendMsg;
+    std::list<std::vector<unsigned char>> vSendMsg;
     CCriticalSection cs_vSend;
     CCriticalSection cs_hSocket;
     CCriticalSection cs_vRecv;
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index bcf4521ea3c8..4e0d7322cb04 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -3812,8 +3812,12 @@ bool PeerLogicValidation::SendMessages(CNode* pto, std::atomic<bool>& interruptM
         //
         std::vector<CInv> vInv;
         {
+            size_t reserve = std::min<size_t>(pto->setInventoryTxToSend.size(), INVENTORY_BROADCAST_MAX_PER_1MB_BLOCK * MaxBlockSize(true) / 1000000);
+            reserve = std::max<size_t>(reserve, pto->vInventoryBlockToSend.size());
+            reserve = std::min<size_t>(reserve, MAX_INV_SZ);
+            vInv.reserve(reserve);
+
             LOCK(pto->cs_inventory);
-            vInv.reserve(std::max<size_t>(pto->vInventoryBlockToSend.size(), INVENTORY_BROADCAST_MAX_PER_1MB_BLOCK * MaxBlockSize(true) / 1000000));
 
             // Add blocks
             for (const uint256& hash : pto->vInventoryBlockToSend) {
diff --git a/src/utiltime.cpp b/src/utiltime.cpp
index f9d910dd19f4..735495dca0fd 100644
--- a/src/utiltime.cpp
+++ b/src/utiltime.cpp
@@ -15,6 +15,8 @@
 #include <boost/date_time/posix_time/posix_time.hpp>
 #include <boost/thread.hpp>
 
+#include <chrono>
+
 static std::atomic<int64_t> nMockTime(0); //!< For unit testing
 
 int64_t GetTime()
@@ -39,16 +41,14 @@ int64_t GetMockTime()
 
 int64_t GetTimeMillis()
 {
-    int64_t now = (boost::posix_time::microsec_clock::universal_time() -
-                   boost::posix_time::ptime(boost::gregorian::date(1970,1,1))).total_milliseconds();
+    int64_t now = std::chrono::time_point_cast<std::chrono::milliseconds>(std::chrono::system_clock::now()).time_since_epoch().count();
     assert(now > 0);
     return now;
 }
 
 int64_t GetTimeMicros()
 {
-    int64_t now = (boost::posix_time::microsec_clock::universal_time() -
-                   boost::posix_time::ptime(boost::gregorian::date(1970,1,1))).total_microseconds();
+    int64_t now = std::chrono::time_point_cast<std::chrono::microseconds>(std::chrono::system_clock::now()).time_since_epoch().count();
     assert(now > 0);
     return now;
 }