5 files changed, 16 insertions, 4 deletions
diff --git a/src/widgets/dialogs/qwizard.cpp b/src/widgets/dialogs/qwizard.cpp
index bf3e44b6a6..974d6f73fd 100644
--- a/src/widgets/dialogs/qwizard.cpp
+++ b/src/widgets/dialogs/qwizard.cpp
@@ -751,6 +751,7 @@ void QWizardPrivate::init()
 
     updateButtonLayout();
 
+    defaultPropertyTable.reserve(NFallbackDefaultProperties);
     for (uint i = 0; i < NFallbackDefaultProperties; ++i)
         defaultPropertyTable.append(QWizardDefaultProperty(fallbackProperties[i].className,
                                                            fallbackProperties[i].property,
diff --git a/src/widgets/graphicsview/qgraphicsanchorlayout_p.cpp b/src/widgets/graphicsview/qgraphicsanchorlayout_p.cpp
index ce9344e2d9..dac8e61645 100644
--- a/src/widgets/graphicsview/qgraphicsanchorlayout_p.cpp
+++ b/src/widgets/graphicsview/qgraphicsanchorlayout_p.cpp
@@ -751,6 +751,7 @@ static AnchorData *createSequence(Graph<AnchorVertex, AnchorData> *graph,
 
     AnchorVertex *prev = before;
     QVector<AnchorData *> edges;
+    edges.reserve(vertices.count() + 1);
 
     const int numVertices = vertices.count();
     edges.reserve(numVertices + 1);
diff --git a/src/widgets/graphicsview/qgraphicsview.cpp b/src/widgets/graphicsview/qgraphicsview.cpp
index decb455988..ac8cd45f9e 100644
--- a/src/widgets/graphicsview/qgraphicsview.cpp
+++ b/src/widgets/graphicsview/qgraphicsview.cpp
@@ -2464,6 +2464,7 @@ QPolygonF QGraphicsView::mapToScene(const QRect &rect) const
 QPolygonF QGraphicsView::mapToScene(const QPolygon &polygon) const
 {
     QPolygonF poly;
+    poly.reserve(polygon.count());
     foreach (const QPoint &point, polygon)
         poly << mapToScene(point);
     return poly;
@@ -2559,6 +2560,7 @@ QPolygon QGraphicsView::mapFromScene(const QRectF &rect) const
 QPolygon QGraphicsView::mapFromScene(const QPolygonF &polygon) const
 {
     QPolygon poly;
+    poly.reserve(polygon.count());
     foreach (const QPointF &point, polygon)
         poly << mapFromScene(point);
     return poly;
@@ -2673,7 +2675,9 @@ void QGraphicsView::updateScene(const QList<QRectF> &rects)
     // Extract and reset dirty scene rect info.
     QVector<QRect> dirtyViewportRects;
     const QVector<QRect> &dirtyRects = d->dirtyRegion.rects();
-    for (int i = 0; i < dirtyRects.size(); ++i)
+    const int dirtyRectsCount = dirtyRects.size();
+    dirtyViewportRects.reserve(dirtyRectsCount + rects.count());
+    for (int i = 0; i < dirtyRectsCount; ++i)
         dirtyViewportRects += dirtyRects.at(i);
     d->dirtyRegion = QRegion();
     d->dirtyBoundingRect = QRect();
diff --git a/src/widgets/itemviews/qcolumnview.cpp b/src/widgets/itemviews/qcolumnview.cpp
index 0ee03035a4..92bbdf6b69 100644
--- a/src/widgets/itemviews/qcolumnview.cpp
+++ b/src/widgets/itemviews/qcolumnview.cpp
@@ -861,11 +861,15 @@ void QColumnView::setColumnWidths(const QList<int> &list)
 {
     Q_D(QColumnView);
     int i = 0;
-    for (; (i < list.count() && i < d->columns.count()); ++i) {
+    const int listCount = list.count();
+    const int count = qMin(listCount, d->columns.count());
+    for (; i < count; ++i) {
         d->columns.at(i)->resize(list.at(i), d->columns.at(i)->height());
         d->columnSizes[i] = list.at(i);
     }
-    for (; i < list.count(); ++i)
+
+    d->columnSizes.reserve(listCount);
+    for (; i < listCount; ++i)
         d->columnSizes.append(list.at(i));
 }
 
diff --git a/src/widgets/widgets/qmenubar.cpp b/src/widgets/widgets/qmenubar.cpp
index 1ad99bed9c..9e76ff082c 100644
--- a/src/widgets/widgets/qmenubar.cpp
+++ b/src/widgets/widgets/qmenubar.cpp
@@ -195,7 +195,9 @@ void QMenuBarPrivate::updateGeometries()
         for(int j = 0; j < shortcutIndexMap.size(); ++j)
             q->releaseShortcut(shortcutIndexMap.value(j));
         shortcutIndexMap.resize(0); // faster than clear
-        for(int i = 0; i < actions.count(); i++)
+        const int actionsCount = actions.count();
+        shortcutIndexMap.reserve(actionsCount);
+        for (int i = 0; i < actionsCount; i++)
             shortcutIndexMap.append(q->grabShortcut(QKeySequence::mnemonic(actions.at(i)->text())));
     }
 #endif