diff --git a/src/libs/cplusplus/OverviewModel.cpp b/src/libs/cplusplus/OverviewModel.cpp
index 3b42204be3f..7b3649ed03c 100644
--- a/src/libs/cplusplus/OverviewModel.cpp
+++ b/src/libs/cplusplus/OverviewModel.cpp
@@ -181,6 +181,7 @@ QVariant OverviewModel::data(const QModelIndex &index, int role) const
         if (Template *t = symbol->asTemplate())
             if (Symbol *templateDeclaration = t->declaration()) {
                 QStringList parameters;
+                parameters.reserve(t->templateParameterCount());
                 for (unsigned i = 0; i < t->templateParameterCount(); ++i)
                     parameters.append(_overview.prettyName(t->templateParameterAt(i)->name()));
                 name += QLatin1Char('<') + parameters.join(QLatin1String(", ")) + QLatin1Char('>');
diff --git a/src/libs/qmldebug/baseenginedebugclient.cpp b/src/libs/qmldebug/baseenginedebugclient.cpp
index 7f9df78d841..f3e5271e32b 100644
--- a/src/libs/qmldebug/baseenginedebugclient.cpp
+++ b/src/libs/qmldebug/baseenginedebugclient.cpp
@@ -193,6 +193,7 @@ void BaseEngineDebugClient::messageReceived(const QByteArray &data)
         int count;
         ds >> count;
         QList<EngineReference> engines;
+        engines.reserve(count);
         for (int ii = 0; ii < count; ++ii) {
             EngineReference eng;
             ds >> eng.m_name;
diff --git a/src/libs/utils/crumblepath.cpp b/src/libs/utils/crumblepath.cpp
index 2d3e7bbb782..e32e344b966 100644
--- a/src/libs/utils/crumblepath.cpp
+++ b/src/libs/utils/crumblepath.cpp
@@ -365,6 +365,7 @@ void CrumblePath::resizeButtons()
         // compute relative sizes
         QList<int> sizes;
         int totalSize = 0;
+        sizes.reserve(m_buttons.length());
         for (int i = 0; i < m_buttons.length() ; ++i) {
             CrumblePathButton *button = m_buttons.at(i);
 
diff --git a/src/plugins/coreplugin/editormanager/editormanager.cpp b/src/plugins/coreplugin/editormanager/editormanager.cpp
index 44c010ba8f2..1bfb5face41 100644
--- a/src/plugins/coreplugin/editormanager/editormanager.cpp
+++ b/src/plugins/coreplugin/editormanager/editormanager.cpp
@@ -931,6 +931,7 @@ Id EditorManagerPrivate::getOpenWithEditorId(const QString &fileName, bool *isEx
     // Built-in
     const EditorManager::EditorFactoryList editors = EditorManager::editorFactories(mt, false);
     const int size = editors.size();
+    allEditorDisplayNames.reserve(size);
     for (int i = 0; i < size; i++) {
         allEditorIds.push_back(editors.at(i)->id());
         allEditorDisplayNames.push_back(editors.at(i)->displayName());
diff --git a/src/plugins/diffeditor/differ.cpp b/src/plugins/diffeditor/differ.cpp
index a99b14a127b..1e452a7d46f 100644
--- a/src/plugins/diffeditor/differ.cpp
+++ b/src/plugins/diffeditor/differ.cpp
@@ -89,6 +89,7 @@ static QList<Diff> decode(const QList<Diff> &diffList,
                                   const QStringList &lines)
 {
     QList<Diff> newDiffList;
+    newDiffList.reserve(diffList.count());
     for (int i = 0; i < diffList.count(); i++) {
         Diff diff = diffList.at(i);
         QString text;
diff --git a/src/plugins/projectexplorer/abiwidget.cpp b/src/plugins/projectexplorer/abiwidget.cpp
index 278a37a3788..5c7671f37f1 100644
--- a/src/plugins/projectexplorer/abiwidget.cpp
+++ b/src/plugins/projectexplorer/abiwidget.cpp
@@ -190,6 +190,7 @@ void AbiWidget::setAbis(const QList<Abi> &abiList, const Abi &current)
 QList<Abi> AbiWidget::supportedAbis() const
 {
     QList<Abi> result;
+    result.reserve(d->m_abi->count());
     for (int i = 1; i < d->m_abi->count(); ++i)
         result << Abi(d->m_abi->itemData(i).toString());
     return result;
diff --git a/src/plugins/texteditor/circularclipboardassist.cpp b/src/plugins/texteditor/circularclipboardassist.cpp
index 6f3e4e43494..0941a83bfec 100644
--- a/src/plugins/texteditor/circularclipboardassist.cpp
+++ b/src/plugins/texteditor/circularclipboardassist.cpp
@@ -94,6 +94,7 @@ public:
         QIcon icon = QIcon::fromTheme(QLatin1String("edit-paste"), Utils::Icons::PASTE.icon()).pixmap(16);
         CircularClipboard * clipboard = CircularClipboard::instance();
         QList<AssistProposalItemInterface *> items;
+        items.reserve(clipboard->size());
         for (int i = 0; i < clipboard->size(); ++i) {
             QSharedPointer<const QMimeData> data = clipboard->next();