diff --git a/src/ivoc/graph.cpp b/src/ivoc/graph.cpp
index 60afbc81dc..9babcd0106 100644
--- a/src/ivoc/graph.cpp
+++ b/src/ivoc/graph.cpp
@@ -2085,6 +2085,7 @@ void Graph::erase_all() {
         Resource::unref(item);
     }
     line_list_.clear();
+    line_list_.shrink_to_fit();
     label_n_ = 0;
 }
 void Graph::family_value() {
diff --git a/src/ivoc/ocpicker.cpp b/src/ivoc/ocpicker.cpp
index 206aa842f0..76da6bee49 100644
--- a/src/ivoc/ocpicker.cpp
+++ b/src/ivoc/ocpicker.cpp
@@ -40,7 +40,6 @@ StandardPicker::StandardPicker() {
     ms_ = unknown;
     for (int i = 0; i < unknown; ++i) {
         handlers_[i] = new std::vector<ButtonHandler*>();
-        handlers_[i]->reserve(1);
     }
 }
 StandardPicker::~StandardPicker() {
diff --git a/src/ivoc/symdir.cpp b/src/ivoc/symdir.cpp
index 510e1c54f5..bfc744dab7 100644
--- a/src/ivoc/symdir.cpp
+++ b/src/ivoc/symdir.cpp
@@ -219,6 +219,7 @@ void SymDirectoryImpl::disconnect(Observable*) {
         delete item;
     }
     symbol_lists_.clear();
+    symbol_lists_.shrink_to_fit();
     obj_ = NULL;
 }
 
diff --git a/src/ivoc/xmenu.cpp b/src/ivoc/xmenu.cpp
index 7278af96b4..74a5609b84 100644
--- a/src/ivoc/xmenu.cpp
+++ b/src/ivoc/xmenu.cpp
@@ -1027,7 +1027,6 @@ HocPanel::HocPanel(const char* name, bool h)
 }
 
 HocPanel::~HocPanel() {
-    long i;
     box_->unref();
     for (auto& item: ilist_) {
         item->HocItem::unref();
@@ -1039,7 +1038,10 @@ HocPanel::~HocPanel() {
     if (it != hoc_panel_list->end()) {
         hoc_panel_list->erase(it);
     }
+    ilist_.clear();
+    ilist_.shrink_to_fit();
     elist_.clear();
+    elist_.shrink_to_fit();
     //	printf("~HocPanel\n");
 }
 
@@ -1059,11 +1061,9 @@ std::vector<HocUpdateItem*>* HocPanel::update_list_;
 void HocPanel::keep_updated() {
     static int cnt = 0;
     if (update_list_ && (++cnt % 10 == 0)) {
-        long i, cnt = update_list_->size();
-        if (cnt)
-            for (auto& item: *update_list_) {
-                item->update_hoc_item();
-            }
+        for (auto& item: *update_list_) {
+            item->update_hoc_item();
+        }
     }
 }
 void HocPanel::keep_updated(HocUpdateItem* hui, bool add) {
@@ -1372,7 +1372,6 @@ void HocPanel::save(std::ostream& o) {
 void HocPanel::write(std::ostream& o) {
     Oc oc;
     char buf[200];
-    long i;
     //	o << "xpanel(\"" << getName() << "\")" << std::endl;
     Sprintf(buf, "xpanel(\"%s\", %d)", getName(), horizontal_);
     o << buf << std::endl;
diff --git a/src/nrncvode/occvode.cpp b/src/nrncvode/occvode.cpp
index 60655d1801..bb2ec2db02 100644
--- a/src/nrncvode/occvode.cpp
+++ b/src/nrncvode/occvode.cpp
@@ -1080,7 +1080,6 @@ void Cvode::play_add(PlayRecord* pr) {
     CvodeThreadData& z = CTD(pr->ith_);
     if (!z.play_) {
         z.play_ = new std::vector<PlayRecord*>();
-        z.play_->reserve(1);
     }
     z.play_->push_back(pr);
 }