diff --git a/profiler_gui/blocks_graphics_view.cpp b/profiler_gui/blocks_graphics_view.cpp
index e52f8ed..2322871 100644
--- a/profiler_gui/blocks_graphics_view.cpp
+++ b/profiler_gui/blocks_graphics_view.cpp
@@ -460,7 +460,7 @@ void EasyGraphicsView::setTree(const ::profiler::thread_blocks_tree_t& _blocksTr
 
         if (!t.children.empty())
         {
-            children_duration = setTree(item, ~0U, t.children, h, y, 0);
+            children_duration = setTree(item, t.children, h, y, 0);
         }
         else
         {
@@ -532,7 +532,7 @@ const EasyGraphicsView::Items &EasyGraphicsView::getItems() const
     return m_items;
 }
 
-qreal EasyGraphicsView::setTree(EasyGraphicsItem* _item, ::profiler::block_index_t _parent, const ::profiler::BlocksTree::children_t& _children, qreal& _height, qreal _y, short _level)
+qreal EasyGraphicsView::setTree(EasyGraphicsItem* _item, const ::profiler::BlocksTree::children_t& _children, qreal& _height, qreal _y, short _level)
 {
     if (_children.empty())
     {
@@ -540,7 +540,8 @@ qreal EasyGraphicsView::setTree(EasyGraphicsItem* _item, ::profiler::block_index
     }
 
     const auto level = static_cast<uint8_t>(_level);
-    _item->reserve(level, static_cast<unsigned int>(_children.size()));
+    const auto n = static_cast<unsigned int>(_children.size());
+    _item->reserve(level, n);
 
     const short next_level = _level + 1;
     bool warned = false;
@@ -592,7 +593,7 @@ qreal EasyGraphicsView::setTree(EasyGraphicsItem* _item, ::profiler::block_index
 
         if (next_level < 256)
         {
-            children_duration = setTree(_item, child_index, child.children, h, _y + ::profiler_gui::GRAPHICS_ROW_SIZE_FULL, next_level);
+            children_duration = setTree(_item, child.children, h, _y + ::profiler_gui::GRAPHICS_ROW_SIZE_FULL, next_level);
         }
         else if (!child.children.empty() && !warned)
         {
@@ -611,7 +612,7 @@ qreal EasyGraphicsView::setTree(EasyGraphicsItem* _item, ::profiler::block_index
         }
 
         b.block = child_index;// &child;
-        b.parent = _parent;
+        b.neighbours = n;
         b.setPos(xbegin, duration);
         //b.totalHeight = ::profiler_gui::GRAPHICS_ROW_SIZE + h;
         b.state = j > 0 || level == 0 ? 0 : -1;
diff --git a/profiler_gui/blocks_graphics_view.h b/profiler_gui/blocks_graphics_view.h
index 014d2e5..55e40b1 100644
--- a/profiler_gui/blocks_graphics_view.h
+++ b/profiler_gui/blocks_graphics_view.h
@@ -185,7 +185,7 @@ private:
     void scaleTo(qreal _scale);
     void scrollTo(const EasyGraphicsItem* _item);
     void onWheel(qreal _mouseX, int _wheelDelta);
-    qreal setTree(EasyGraphicsItem* _item, ::profiler::block_index_t _parent, const ::profiler::BlocksTree::children_t& _children, qreal& _height, qreal _y, short _level);
+    qreal setTree(EasyGraphicsItem* _item, const ::profiler::BlocksTree::children_t& _children, qreal& _height, qreal _y, short _level);
 
 private slots:
 
diff --git a/profiler_gui/blocks_tree_widget.cpp b/profiler_gui/blocks_tree_widget.cpp
index f7de000..52ced8c 100644
--- a/profiler_gui/blocks_tree_widget.cpp
+++ b/profiler_gui/blocks_tree_widget.cpp
@@ -116,16 +116,16 @@ EasyTreeWidget::EasyTreeWidget(QWidget* _parent)
     header_item->setText(COL_DURATION, "Duration");
     header_item->setText(COL_SELF_DURATION, "Self Dur.");
     //header_item->setToolTip(COL_SELF_DURATION, "");
-    header_item->setText(COL_DURATION_SUM_PER_PARENT, "Tot. Dur./Parent");
-    header_item->setText(COL_DURATION_SUM_PER_FRAME, "Tot. Dur./Frame");
-    header_item->setText(COL_DURATION_SUM_PER_THREAD, "Tot. Dur./Thread");
+    header_item->setText(COL_DURATION_SUM_PER_PARENT, "Sum Dur./Parent");
+    header_item->setText(COL_DURATION_SUM_PER_FRAME,  "Sum Dur./Frame");
+    header_item->setText(COL_DURATION_SUM_PER_THREAD, "Sum Dur./Thread");
 
     header_item->setText(COL_SELF_DURATION_PERCENT, "Self %");
     header_item->setText(COL_PERCENT_PER_PARENT, "% / Parent");
     header_item->setText(COL_PERCENT_PER_FRAME, "% / Frame");
-    header_item->setText(COL_PERCENT_SUM_PER_FRAME, "Tot. % / Frame");
-    header_item->setText(COL_PERCENT_SUM_PER_PARENT, "Tot. % / Parent");
-    header_item->setText(COL_PERCENT_SUM_PER_THREAD, "Tot. % / Thread");
+    header_item->setText(COL_PERCENT_SUM_PER_FRAME,  "Sum % / Frame");
+    header_item->setText(COL_PERCENT_SUM_PER_PARENT, "Sum % / Parent");
+    header_item->setText(COL_PERCENT_SUM_PER_THREAD, "Sum % / Thread");
 
     header_item->setText(COL_END, "End, ms");
 
@@ -335,16 +335,27 @@ void EasyTreeWidget::clearSilent(bool _global)
 
     if (!_global)
     {
-        if (EASY_GLOBALS.collapse_items_on_tree_close) for (auto item : m_items)
+        if (EASY_GLOBALS.collapse_items_on_tree_close)
+#ifdef EASY_TREE_WIDGET__USE_VECTOR
+            for (auto item : m_items)
+#else
+            for (auto& item : m_items)
+#endif
         {
+#ifdef EASY_TREE_WIDGET__USE_VECTOR
             auto& gui_block = item->guiBlock();
-            ::profiler_gui::set_max(gui_block.tree_item);
             gui_block.expanded = false;
+            ::profiler_gui::set_max(gui_block.tree_item);
+#else
+            item.second->guiBlock().expanded = false;
+#endif
         }
+#ifdef EASY_TREE_WIDGET__USE_VECTOR
         else for (auto item : m_items)
         {
             ::profiler_gui::set_max(item->guiBlock().tree_item);
         }
+#endif
     }
 
     m_items.clear();
@@ -656,8 +667,13 @@ void EasyTreeWidget::onCollapseAllClicked(bool)
 
     if (EASY_GLOBALS.bind_scene_and_tree_expand_status)
     {
+#ifdef EASY_TREE_WIDGET__USE_VECTOR
         for (auto item : m_items)
             item->guiBlock().expanded = false;
+#else
+        for (auto& item : m_items)
+            item.second->guiBlock().expanded = false;
+#endif
         emit EASY_GLOBALS.events.itemsExpandStateChanged();
     }
 }
@@ -673,9 +689,13 @@ void EasyTreeWidget::onExpandAllClicked(bool)
 
     if (EASY_GLOBALS.bind_scene_and_tree_expand_status)
     {
-        for (auto item : m_items)
-        {
+#ifdef EASY_TREE_WIDGET__USE_VECTOR
+        for (auto item : m_items){
             auto& b = item->guiBlock();
+#else
+        for (auto& item : m_items){
+            auto& b = item.second->guiBlock();
+#endif
             b.expanded = !b.tree.children.empty();
         }
 
@@ -811,11 +831,19 @@ void EasyTreeWidget::onColorizeRowsTriggered(bool _colorize)
     collapseAll(); // Without collapseAll() changing items process is VERY VERY SLOW.
     // TODO: Find the reason of such behavior. QSignalBlocker(this) does not help. QSignalBlocker(item) does not work, because items are not inherited from QObject.
 
+#ifdef EASY_TREE_WIDGET__USE_VECTOR
     for (auto item : m_items)
     {
         if (item->parent() != nullptr)
             item->colorize(m_bColorRows);
     }
+#else
+    for (auto& item : m_items)
+    {
+        if (item.second->parent() != nullptr)
+            item.second->colorize(m_bColorRows);
+    }
+#endif
 
     // Scroll back to previously selected item
     if (current)
@@ -843,9 +871,15 @@ void EasyTreeWidget::onSelectedBlockChange(uint32_t _block_index)
 
     if (_block_index < EASY_GLOBALS.gui_blocks.size())
     {
+#ifdef EASY_TREE_WIDGET__USE_VECTOR
         const auto i = easyBlock(_block_index).tree_item;
         if (i < m_items.size())
             item = m_items[i];
+#else
+        auto it = m_items.find(_block_index);
+        if (it != m_items.end())
+            item = it->second;
+#endif
     }
 
     if (item != nullptr)
diff --git a/profiler_gui/common_types.h b/profiler_gui/common_types.h
index 47a0d33..9a7b815 100644
--- a/profiler_gui/common_types.h
+++ b/profiler_gui/common_types.h
@@ -155,13 +155,12 @@ inline ::profiler::color_t textColorForRgb(::profiler::color_t _color)
 #pragma pack(push, 1)
 struct EasyBlockItem Q_DECL_FINAL
 {
-    qreal                             x; ///< x coordinate of the item (this is made qreal=double to avoid mistakes on very wide scene)
-    float                             w; ///< Width of the item
-    ::profiler::block_index_t     block; ///< Index of profiler block
-    ::profiler::block_index_t    parent; ///< Index of parent profiler block
-    uint32_t             children_begin; ///< Index of first child item on the next sublevel
-    //uint16_t                totalHeight; ///< Total height of the item including heights of all it's children
-    int8_t                        state; ///< 0 = no change, 1 = paint, -1 = do not paint
+    qreal                              x; ///< x coordinate of the item (this is made qreal=double to avoid mistakes on very wide scene)
+    float                              w; ///< Width of the item
+    ::profiler::block_index_t      block; ///< Index of profiler block
+    ::profiler::block_index_t neighbours; ///< Number of neighbours (parent.children.size())
+    uint32_t              children_begin; ///< Index of first child item on the next sublevel
+    int8_t                         state; ///< 0 = no change, 1 = paint, -1 = do not paint
 
     // Possible optimizations:
     // 1) We can save 1 more byte per block if we will use char instead of short + real time calculations for "totalHeight" var;
@@ -175,10 +174,13 @@ struct EasyBlockItem Q_DECL_FINAL
 
 }; // END of struct EasyBlockItem.
 
+//#define EASY_TREE_WIDGET__USE_VECTOR
 struct EasyBlock Q_DECL_FINAL
 {
     ::profiler::BlocksTree       tree;
+#ifdef EASY_TREE_WIDGET__USE_VECTOR
     uint32_t                tree_item;
+#endif
     uint32_t      graphics_item_index;
     uint8_t       graphics_item_level;
     uint8_t             graphics_item;
@@ -188,7 +190,9 @@ struct EasyBlock Q_DECL_FINAL
 
     EasyBlock(EasyBlock&& that)
         : tree(::std::move(that.tree))
+#ifdef EASY_TREE_WIDGET__USE_VECTOR
         , tree_item(that.tree_item)
+#endif
         , graphics_item_index(that.graphics_item_index)
         , graphics_item_level(that.graphics_item_level)
         , graphics_item(that.graphics_item)
diff --git a/profiler_gui/easy_graphics_item.cpp b/profiler_gui/easy_graphics_item.cpp
index 2fc8465..4d097b5 100644
--- a/profiler_gui/easy_graphics_item.cpp
+++ b/profiler_gui/easy_graphics_item.cpp
@@ -207,6 +207,8 @@ void EasyGraphicsItem::paint(QPainter* _painter, const QStyleOptionGraphicsItem*
     if (gotItems)
     {
         static const auto MAX_CHILD_INDEX = ::profiler_gui::numeric_max<decltype(::profiler_gui::EasyBlockItem::children_begin)>();
+        const int narrow_size_half = EASY_GLOBALS.blocks_narrow_size >> 1;
+
         //auto const skip_children = [this, &levelsNumber](short next_level, decltype(::profiler_gui::EasyBlockItem::children_begin) children_begin)
         //{
         //    // Mark that we would not paint children of current item
@@ -270,30 +272,15 @@ void EasyGraphicsItem::paint(QPainter* _painter, const QStyleOptionGraphicsItem*
                 {
                     // This item is not visible
                     //skip_children(next_level, item.children_begin);
-
-                    if (item.parent != ~0U)
-                    {
-                        const auto n = static_cast<uint32_t>(easyBlock(item.parent).tree.children.size());
-                        if (neighbour < n)
-                            i += n - neighbour - 1; // Skip all neighbours
-                    }
-
+                    if (neighbour < item.neighbours)
+                        i += item.neighbours - neighbour - 1; // Skip all neighbours
                     continue;
                 }
 
-                if (state == BLOCK_ITEM_DO_PAINT_FIRST)
+                if (state == BLOCK_ITEM_DO_PAINT_FIRST && item.children_begin == MAX_CHILD_INDEX && next_level < levelsNumber && neighbour < (item.neighbours-1))
                 {
                     // Paint only first child which has own children
-
-                    if (item.children_begin == MAX_CHILD_INDEX && next_level < levelsNumber)
-                        continue; // This item has no children and would not be painted
-
-                    if (item.parent != ~0U)
-                    {
-                        const auto n = static_cast<uint32_t>(easyBlock(item.parent).tree.children.size());
-                        if (neighbour < n)
-                            i += n - neighbour - 1; // Skip all neighbours
-                    }
+                    continue; // This item has no children and would not be painted
                 }
 
                 const auto& itemBlock = easyBlock(item.block);
@@ -324,6 +311,18 @@ void EasyGraphicsItem::paint(QPainter* _painter, const QStyleOptionGraphicsItem*
                     x = prevRight;
                 }
 
+                if (EASY_GLOBALS.hide_minsize_blocks && w < EASY_GLOBALS.blocks_size_min && l > 0)
+                {
+                    // Hide blocks (except top-level blocks) which width is less than 1 pixel
+                    continue;
+                }
+
+                if (state == BLOCK_ITEM_DO_PAINT_FIRST && neighbour < item.neighbours)
+                {
+                    // Paint only first child which has own children
+                    i += item.neighbours - neighbour - 1; // Skip all neighbours
+                }
+
                 const auto& itemDesc = easyDescriptor(itemBlock.tree.node->id());
 
                 int h = 0, flags = 0;
@@ -450,7 +449,7 @@ void EasyGraphicsItem::paint(QPainter* _painter, const QStyleOptionGraphicsItem*
                     prevRight = rect.right() + EASY_GLOBALS.blocks_spacing;
                     if (w < EASY_GLOBALS.blocks_narrow_size)
                     {
-                        dont_skip_children(next_level, item.children_begin, BLOCK_ITEM_DO_PAINT_FIRST);
+                        dont_skip_children(next_level, item.children_begin, w < narrow_size_half ? BLOCK_ITEM_DO_PAINT_FIRST : BLOCK_ITEM_DO_PAINT);
                         continue;
                     }
 
diff --git a/profiler_gui/globals.cpp b/profiler_gui/globals.cpp
index 8e25057..f6608f9 100644
--- a/profiler_gui/globals.cpp
+++ b/profiler_gui/globals.cpp
@@ -75,6 +75,7 @@ namespace profiler_gui {
         , add_zero_blocks_to_hierarchy(false)
         , draw_graphics_items_borders(true)
         , hide_narrow_children(false)
+        , hide_minsize_blocks(false)
         , display_only_relevant_stats(true)
         , collapse_items_on_tree_close(false)
         , all_items_expanded_by_default(true)
diff --git a/profiler_gui/globals.h b/profiler_gui/globals.h
index 5d78210..46afbdd 100644
--- a/profiler_gui/globals.h
+++ b/profiler_gui/globals.h
@@ -124,7 +124,8 @@ namespace profiler_gui {
         bool                          enable_zero_length; ///< Enable zero length blocks (if true, then such blocks will have width == 1 pixel on each scale)
         bool                add_zero_blocks_to_hierarchy; ///< Enable adding zero blocks into hierarchy tree
         bool                 draw_graphics_items_borders; ///< Draw borders for graphics blocks or not
-        bool                        hide_narrow_children; ///< Hide children for narrow graphics blocks
+        bool                        hide_narrow_children; ///< Hide children for narrow graphics blocks (See blocks_narrow_size)
+        bool                         hide_minsize_blocks; ///< Hide blocks which screen size is less than blocks_size_min
         bool                 display_only_relevant_stats; ///< Display only relevant information in ProfTreeWidget (excludes min, max, average times if there are only 1 calls number)
         bool                collapse_items_on_tree_close; ///< Collapse all items which were displayed in the hierarchy tree after tree close/reset
         bool               all_items_expanded_by_default; ///< Expand all items after file is opened
diff --git a/profiler_gui/main_window.cpp b/profiler_gui/main_window.cpp
index f670480..1191121 100644
--- a/profiler_gui/main_window.cpp
+++ b/profiler_gui/main_window.cpp
@@ -264,13 +264,19 @@ EasyMainWindow::EasyMainWindow() : Parent(), m_lastAddress("localhost"), m_lastP
     action->setToolTip("Draw borders for blocks on diagram.\nThis reduces performance.");
     action->setCheckable(true);
     action->setChecked(EASY_GLOBALS.draw_graphics_items_borders);
-    connect(action, &QAction::triggered, this, &This::onDrawBordersChanged);
+    connect(action, &QAction::triggered, [this](bool _checked){ EASY_GLOBALS.draw_graphics_items_borders = _checked; refreshDiagram(); });
 
-    action = submenu->addAction("Hide narrow children");
-    action->setToolTip("Children blocks will be hidden by narrow\nparent blocks. See also \"Blocks narrow size\".\nThis improves performance.");
+    action = submenu->addAction("Overlap narrow children");
+    action->setToolTip("Children blocks will be overlaped by narrow\nparent blocks. See also \'Blocks narrow size\'.\nThis improves performance.");
     action->setCheckable(true);
     action->setChecked(EASY_GLOBALS.hide_narrow_children);
-    connect(action, &QAction::triggered, this, &This::onHideNarrowChildrenChanged);
+    connect(action, &QAction::triggered, [this](bool _checked){ EASY_GLOBALS.hide_narrow_children = _checked; refreshDiagram(); });
+
+    action = submenu->addAction("Hide min-size blocks");
+    action->setToolTip("Hides blocks which screen size\nis less than \'Min blocks size\'.");
+    action->setCheckable(true);
+    action->setChecked(EASY_GLOBALS.hide_minsize_blocks);
+    connect(action, &QAction::triggered, [this](bool _checked){ EASY_GLOBALS.hide_minsize_blocks = _checked; refreshDiagram(); });
 
     action = submenu->addAction("Build hierarchy only for current thread");
     action->setToolTip("Hierarchy tree will be built\nfor blocks from current thread only.\nThis improves performance\nand saves a lot of memory.");
@@ -798,18 +804,6 @@ void EasyMainWindow::onEnableDisableStatistics(bool _checked)
     }
 }
 
-void EasyMainWindow::onDrawBordersChanged(bool _checked)
-{
-    EASY_GLOBALS.draw_graphics_items_borders = _checked;
-    refreshDiagram();
-}
-
-void EasyMainWindow::onHideNarrowChildrenChanged(bool _checked)
-{
-    EASY_GLOBALS.hide_narrow_children = _checked;
-    refreshDiagram();
-}
-
 void EasyMainWindow::onCollapseItemsAfterCloseChanged(bool _checked)
 {
     EASY_GLOBALS.collapse_items_on_tree_close = _checked;
@@ -979,6 +973,10 @@ void EasyMainWindow::loadSettings()
     if (!flag.isNull())
         EASY_GLOBALS.hide_narrow_children = flag.toBool();
 
+    flag = settings.value("hide_minsize_blocks");
+    if (!flag.isNull())
+        EASY_GLOBALS.hide_minsize_blocks = flag.toBool();
+
     flag = settings.value("collapse_items_on_tree_close");
     if (!flag.isNull())
         EASY_GLOBALS.collapse_items_on_tree_close = flag.toBool();
@@ -1062,6 +1060,7 @@ void EasyMainWindow::saveSettingsAndGeometry()
     settings.setValue("blocks_narrow_size", EASY_GLOBALS.blocks_narrow_size);
     settings.setValue("draw_graphics_items_borders", EASY_GLOBALS.draw_graphics_items_borders);
     settings.setValue("hide_narrow_children", EASY_GLOBALS.hide_narrow_children);
+    settings.setValue("hide_minsize_blocks", EASY_GLOBALS.hide_minsize_blocks);
     settings.setValue("collapse_items_on_tree_close", EASY_GLOBALS.collapse_items_on_tree_close);
     settings.setValue("all_items_expanded_by_default", EASY_GLOBALS.all_items_expanded_by_default);
     settings.setValue("only_current_thread_hierarchy", EASY_GLOBALS.only_current_thread_hierarchy);
@@ -1208,7 +1207,9 @@ void EasyMainWindow::onFileReaderTimeout()
             for (decltype(nblocks) i = 0; i < nblocks; ++i) {
                 auto& guiblock = EASY_GLOBALS.gui_blocks[i];
                 guiblock.tree = ::std::move(blocks[i]);
+#ifdef EASY_TREE_WIDGET__USE_VECTOR
                 ::profiler_gui::set_max(guiblock.tree_item);
+#endif
             }
 
             static_cast<EasyGraphicsViewWidget*>(m_graphicsView->widget())->view()->setTree(EASY_GLOBALS.profiler_blocks);
diff --git a/profiler_gui/main_window.h b/profiler_gui/main_window.h
index 040e1e2..89c7bee 100644
--- a/profiler_gui/main_window.h
+++ b/profiler_gui/main_window.h
@@ -238,8 +238,6 @@ protected slots:
     void onUnitsChanged(bool);
     void onEventIndicatorsChange(bool);
     void onEnableDisableStatistics(bool);
-    void onDrawBordersChanged(bool);
-    void onHideNarrowChildrenChanged(bool);
     void onCollapseItemsAfterCloseChanged(bool);
     void onAllItemsExpandedByDefaultChange(bool);
     void onBindExpandStatusChange(bool);
diff --git a/profiler_gui/tree_widget_loader.cpp b/profiler_gui/tree_widget_loader.cpp
index 73cd0a1..390b417 100644
--- a/profiler_gui/tree_widget_loader.cpp
+++ b/profiler_gui/tree_widget_loader.cpp
@@ -399,8 +399,10 @@ void FillTreeClass<T>::setTreeInternal2(T& _safelocker, Items& _items, ThreadedI
         item->setBackgroundColor(color);
         item->setTextColor(fgColor);
 
+#ifdef EASY_TREE_WIDGET__USE_VECTOR
         auto item_index = static_cast<unsigned int>(_items.size());
         _items.push_back(item);
+#endif
 
         size_t children_items_number = 0;
         ::profiler::timestamp_t children_duration = 0;
@@ -425,7 +427,9 @@ void FillTreeClass<T>::setTreeInternal2(T& _safelocker, Items& _items, ThreadedI
         if (children_items_number > 0 || !_strict || (startTime >= _left && endTime <= _right))
         {
             //total_items += children_items_number + 1;
+#ifdef EASY_TREE_WIDGET__USE_VECTOR
             gui_block.tree_item = item_index;
+#endif
 
             if (_colorizeRows)
                 item->colorize(_colorizeRows);
@@ -433,10 +437,15 @@ void FillTreeClass<T>::setTreeInternal2(T& _safelocker, Items& _items, ThreadedI
             if (gui_block.expanded)
                 item->setExpanded(true);
 
+#ifndef EASY_TREE_WIDGET__USE_VECTOR
+            _items.insert(::std::make_pair(block.tree, item));
+#endif
         }
         else
         {
+#ifdef EASY_TREE_WIDGET__USE_VECTOR
             _items.pop_back();
+#endif
             delete item;
         }
 
@@ -612,8 +621,10 @@ size_t FillTreeClass<T>::setTreeInternal(T& _safelocker, Items& _items, const ::
         item->setBackgroundColor(color);
         item->setTextColor(fgColor);
 
+#ifdef EASY_TREE_WIDGET__USE_VECTOR
         auto item_index = static_cast<uint32_t>(_items.size());
         _items.push_back(item);
+#endif
 
         size_t children_items_number = 0;
         ::profiler::timestamp_t children_duration = 0;
@@ -638,17 +649,25 @@ size_t FillTreeClass<T>::setTreeInternal(T& _safelocker, Items& _items, const ::
         if (children_items_number > 0 || !_strict || (startTime >= _left && endTime <= _right))
         {
             total_items += children_items_number + 1;
+#ifdef EASY_TREE_WIDGET__USE_VECTOR
             gui_block.tree_item = item_index;
+#endif
 
             if (_colorizeRows)
                 item->colorize(_colorizeRows);
 
             if (gui_block.expanded)
                 item->setExpanded(true);
+
+#ifndef EASY_TREE_WIDGET__USE_VECTOR
+            _items.insert(::std::make_pair(child_index, item));
+#endif
         }
         else
         {
+#ifdef EASY_TREE_WIDGET__USE_VECTOR
             _items.pop_back();
+#endif
             delete item;
         }
     }
diff --git a/profiler_gui/tree_widget_loader.h b/profiler_gui/tree_widget_loader.h
index c5b9e7d..1407295 100644
--- a/profiler_gui/tree_widget_loader.h
+++ b/profiler_gui/tree_widget_loader.h
@@ -57,7 +57,13 @@
 //////////////////////////////////////////////////////////////////////////
 
 class EasyTreeWidgetItem;
+
+#ifndef EASY_TREE_WIDGET__USE_VECTOR
+typedef ::std::unordered_map<::profiler::block_index_t, EasyTreeWidgetItem*, ::profiler_gui::do_no_hash<::profiler::block_index_t>::hasher_t> Items;
+#else
 typedef ::std::vector<EasyTreeWidgetItem*> Items;
+#endif
+
 typedef ::std::vector<::std::pair<::profiler::thread_id_t, EasyTreeWidgetItem*> > ThreadedItems;
 typedef ::std::unordered_map<::profiler::thread_id_t, EasyTreeWidgetItem*, ::profiler_gui::do_no_hash<::profiler::thread_id_t>::hasher_t> RootsMap;