diff --git a/src/core/MainWindow.cpp b/src/core/MainWindow.cpp
index 87392130..e09a0fc4 100644
--- a/src/core/MainWindow.cpp
+++ b/src/core/MainWindow.cpp
@@ -200,7 +200,10 @@ void MainWindow::initUI()
     connect(ui->actionOverview, &QAction::toggled, [this](bool checked) {
         if (checked) {
             overviewDock->userClosed = false;
-            adjustOverview();
+            forceUpdateOverview();
+            if (targetGraphDock) {
+                toggleOverview(true, targetGraphDock);
+            }
         }
     });
     sectionsDock = new SectionsWidget(this, ui->actionSections);
@@ -298,34 +301,35 @@ void MainWindow::toggleOverview(bool visibility, GraphWidget *targetGraph)
         return;
     }
     targetGraphDock = targetGraph;
-    connect(targetGraphDock->graphView, SIGNAL(refreshBlock()), this, SLOT(adjustOverview()));
-    connect(targetGraphDock->graphView, SIGNAL(viewRefreshed()), this, SLOT(adjustOverview()));
-    connect(targetGraphDock->graphView, SIGNAL(viewZoomed()), this, SLOT(adjustOverview()));
+    connect(targetGraphDock->graphView, SIGNAL(refreshBlock()), this, SLOT(updateOverview()));
+    connect(targetGraphDock->graphView, SIGNAL(viewRefreshed()), this, SLOT(updateOverview()));
+    connect(targetGraphDock->graphView, SIGNAL(viewZoomed()), this, SLOT(updateOverview()));
     connect(targetGraphDock, &GraphWidget::graphClose, [this]() {
         disconnectOverview();
         enableOverviewMenu(false);
         overviewDock->hide();
     });
     connect(overviewDock->graphView, SIGNAL(mouseMoved()), this, SLOT(adjustGraph()));
-    connect(overviewDock, &QDockWidget::dockLocationChanged, this, &MainWindow::adjustOverview);
+    connect(overviewDock->graphView, SIGNAL(refreshBlock()), this, SLOT(updateOverviewAddr()));
+    connect(overviewDock, &QDockWidget::dockLocationChanged, this, &MainWindow::forceUpdateOverview);
     connect(overviewDock, &OverviewWidget::graphClose, [this]() {
         ui->actionOverview->setChecked(false);
         if (!core->isGraphEmpty()) {
             overviewDock->userClosed = true;
         }
     });
-    connect(overviewDock, SIGNAL(resized()), this, SLOT(adjustOverview()));
+    connect(overviewDock, SIGNAL(resized()), this, SLOT(forceUpdateOverview()));
 }
 
 void MainWindow::disconnectOverview()
 {
-    disconnect(targetGraphDock->graphView, SIGNAL(refreshBlock()), this, SLOT(adjustOverview()));
-    disconnect(targetGraphDock->graphView, SIGNAL(viewRefreshed()), this, SLOT(adjustOverview()));
-    disconnect(targetGraphDock->graphView, SIGNAL(viewZoomed()), this, SLOT(adjustOverview()));
+    disconnect(targetGraphDock->graphView, SIGNAL(refreshBlock()), this, SLOT(updateOverview()));
+    disconnect(targetGraphDock->graphView, SIGNAL(viewRefreshed()), this, SLOT(updateOverview()));
+    disconnect(targetGraphDock->graphView, SIGNAL(viewZoomed()), this, SLOT(updateOverview()));
     disconnect(overviewDock->graphView, SIGNAL(mouseMoved()), this, SLOT(adjustGraph()));
-    disconnect(overviewDock, &QDockWidget::dockLocationChanged, this, &MainWindow::adjustOverview);
-    disconnect(overviewDock, SIGNAL(resized()), this, SLOT(adjustOverview()));
-    disconnect(overviewDock, &QDockWidget::visibilityChanged, this, nullptr);
+    disconnect(overviewDock->graphView, SIGNAL(refreshBlock()), this, SLOT(updateOverviewAddr()));
+    disconnect(overviewDock, &QDockWidget::dockLocationChanged, this, &MainWindow::forceUpdateOverview);
+    disconnect(overviewDock, SIGNAL(resized()), this, SLOT(forceUpdateOverview()));
 }
 
 void MainWindow::setOverviewData()
@@ -334,17 +338,50 @@ void MainWindow::setOverviewData()
             targetGraphDock->graphView->getHeight(), targetGraphDock->graphView->getBlocks());
 }
 
-void MainWindow::adjustOverview()
+bool MainWindow::isOverviewActive()
 {
     if (!overviewDock || overviewDock->userClosed) {
-        return;
+        return false;
     }
     if (core->isGraphEmpty()) {
         enableOverviewMenu(false);
         overviewDock->hide();
+        return false;
+    }
+    return true;
+}
+
+void MainWindow::updateOverviewAddr()
+{
+    overviewDock->graphView->currentFcnAddr = targetGraphDock->graphView->currentFcnAddr;
+}
+
+void MainWindow::forceUpdateOverview()
+{
+    if (!isOverviewActive()) {
         return;
     }
+    overviewDock->graphView->useCache = false;
     setOverviewData();
+    drawOverview();
+}
+
+void MainWindow::updateOverview()
+{
+    if (!isOverviewActive()) {
+        return;
+    }
+    if (overviewDock->graphView->currentFcnAddr != targetGraphDock->graphView->currentFcnAddr) {
+        overviewDock->graphView->useCache = false;
+        setOverviewData();
+    } else {
+        overviewDock->graphView->useCache = true;
+    }
+    drawOverview();
+}
+
+void MainWindow::drawOverview()
+{
     qreal curScale = overviewDock->graphView->current_scale;
     qreal baseScale = targetGraphDock->graphView->current_scale;
     qreal w = targetGraphDock->graphView->viewport()->width() * curScale / baseScale;
diff --git a/src/core/MainWindow.h b/src/core/MainWindow.h
index eb4804ab..67c80f2d 100644
--- a/src/core/MainWindow.h
+++ b/src/core/MainWindow.h
@@ -137,10 +137,6 @@ public slots:
     void openNewFileFailed();
 
     void toggleOverview(bool visibility, GraphWidget *targetGraph);
-    void disconnectOverview();
-    void adjustOverview();
-    void adjustGraph();
-
 private slots:
     void on_actionAbout_triggered();
     void on_actionIssue_triggered();
@@ -193,6 +189,13 @@ private slots:
     void changeDebugView();
     void changeDefinedView();
 
+    void disconnectOverview();
+    void updateOverview();
+    void forceUpdateOverview();
+    void updateOverviewAddr();
+    void drawOverview();
+    void adjustGraph();
+
 private:
     CutterCore *core;
 
@@ -271,6 +274,7 @@ private:
 
     void updateDockActionsChecked();
     void setOverviewData();
+    bool isOverviewActive();
 };
 
 #endif // MAINWINDOW_H
diff --git a/src/widgets/DisassemblerGraphView.cpp b/src/widgets/DisassemblerGraphView.cpp
index d6ac3327..3f7a821f 100644
--- a/src/widgets/DisassemblerGraphView.cpp
+++ b/src/widgets/DisassemblerGraphView.cpp
@@ -182,6 +182,7 @@ void DisassemblerGraphView::loadCurrentGraph()
     QJsonArray functions;
     RAnalFunction *fcn = Core()->functionAt(seekable->getOffset());
     if (fcn) {
+        currentFcnAddr = fcn->addr;
         QJsonDocument functionsDoc = Core()->cmdj("agJ " + RAddressString(fcn->addr));
         functions = functionsDoc.array();
     }
@@ -211,14 +212,8 @@ void DisassemblerGraphView::loadCurrentGraph()
     // Refresh global "empty graph" variable so other widget know there is nothing to show here
     Core()->setGraphEmpty(emptyGraph);
 
-    Analysis anal;
-    anal.ready = true;
-
     QJsonValue funcRef = functions.first();
     QJsonObject func = funcRef.toObject();
-    Function f;
-    f.ready = true;
-    f.entry = func["offset"].toVariant().toULongLong();
 
     windowTitle = tr("Graph");
     QString funcName = func["name"].toString().trimmed();
@@ -312,15 +307,10 @@ void DisassemblerGraphView::loadCurrentGraph()
         }
         disassembly_blocks[db.entry] = db;
         prepareGraphNode(gb);
-        f.blocks.push_back(db);
 
         addBlock(gb);
     }
 
-    anal.functions[f.entry] = f;
-    anal.status = "Ready.";
-    anal.entry = f.entry;
-
     if (!func["blocks"].toArray().isEmpty()) {
         computeGraph(entry);
     }
diff --git a/src/widgets/DisassemblerGraphView.h b/src/widgets/DisassemblerGraphView.h
index e06fb1c8..c3783e16 100644
--- a/src/widgets/DisassemblerGraphView.h
+++ b/src/widgets/DisassemblerGraphView.h
@@ -83,32 +83,6 @@ class DisassemblerGraphView : public GraphView
         bool indirectcall = false;
     };
 
-    struct Function {
-        bool ready;
-        ut64 entry;
-        ut64 update_id;
-        std::vector<DisassemblyBlock> blocks;
-    };
-
-    struct Analysis {
-        ut64 entry = 0;
-        std::unordered_map<ut64, Function> functions;
-        bool ready = false;
-        ut64 update_id = 0;
-        QString status = "Analyzing...";
-
-        bool find_instr(ut64 addr, ut64 &func, ut64 &instr)
-        {
-            //TODO implement
-            Q_UNUSED(addr);
-            Q_UNUSED(func);
-            Q_UNUSED(instr);
-            return false;
-        }
-
-        //dummy class
-    };
-
 public:
     DisassemblerGraphView(QWidget *parent);
     ~DisassemblerGraphView() override;
@@ -129,7 +103,6 @@ public:
 
     int getWidth() { return width; }
     int getHeight() { return height; }
-
     std::unordered_map<ut64, GraphBlock> getBlocks() { return blocks; }
 public slots:
     void refreshView();
diff --git a/src/widgets/GraphView.cpp b/src/widgets/GraphView.cpp
index 536da0f4..c43edd31 100644
--- a/src/widgets/GraphView.cpp
+++ b/src/widgets/GraphView.cpp
@@ -381,7 +381,12 @@ QPolygonF GraphView::recalculatePolygon(QPolygonF polygon)
 void GraphView::paintEvent(QPaintEvent *event)
 {
     Q_UNUSED(event);
-    QPainter p(viewport());
+    if (useCache) {
+        drawGraph();
+        return;
+    }
+    pixmap = QPixmap(viewport()->width(), viewport()->height());
+    QPainter p(&pixmap);
 
     p.setRenderHint(QPainter::Antialiasing);
 
@@ -436,10 +441,18 @@ void GraphView::paintEvent(QPaintEvent *event)
             }
         }
     }
-
+    drawGraph();
     emit refreshBlock();
 }
 
+void GraphView::drawGraph()
+{
+    QRectF target(0.0, 0.0, viewport()->width(), viewport()->height());
+    QRectF source(0.0, 0.0, viewport()->width(), viewport()->height());
+    QPainter p(viewport());
+    p.drawPixmap(target, pixmap, source);
+}
+
 // Prepare graph
 // This computes the position and (row/col based) size of the block
 // Recursively calls itself for each child of the GraphBlock
diff --git a/src/widgets/GraphView.h b/src/widgets/GraphView.h
index 123ffc10..ba81188c 100644
--- a/src/widgets/GraphView.h
+++ b/src/widgets/GraphView.h
@@ -104,6 +104,18 @@ public:
     int offset_x = 0;
     int offset_y = 0;
 
+    /**
+     * @brief flag to control if the cached pixmap should be used
+     */
+    bool useCache = false;
+
+    /**
+     * @brief keep the current addr of the fcn of Graph
+     * Everytime overview updates its contents, it compares this value with the one in Graph
+     * if they aren't same, then Overview needs to update the pixmap cache.
+     */
+    ut64 currentFcnAddr = 0;
+
 protected:
     std::unordered_map<ut64, GraphBlock> blocks;
     QColor backgroundColor = QColor(Qt::white);
@@ -129,6 +141,7 @@ protected:
     virtual void wheelEvent(QWheelEvent *event) override;
     virtual EdgeConfiguration edgeConfiguration(GraphView::GraphBlock &from, GraphView::GraphBlock *to);
 
+    void drawGraph();
     bool event(QEvent *event) override;
 
     // Mouse events
@@ -142,6 +155,12 @@ protected:
     void centerY();
     int width = 0;
     int height = 0;
+
+    /**
+     * @brief pixmap that caches the graph nodes
+     */
+    QPixmap pixmap;
+
 private:
     bool checkPointClicked(QPointF &point, int x, int y, bool above_y = false);
 
diff --git a/src/widgets/OverviewView.cpp b/src/widgets/OverviewView.cpp
index 990685ea..b9f1fe75 100644
--- a/src/widgets/OverviewView.cpp
+++ b/src/widgets/OverviewView.cpp
@@ -19,14 +19,14 @@ void OverviewView::setData(int baseWidth, int baseHeight, std::unordered_map<ut6
     width = baseWidth;
     height = baseHeight;
     blocks = baseBlocks;
-    refreshView();
+    scaleAndCenter();
 }
 
 OverviewView::~OverviewView()
 {
 }
 
-void OverviewView::refreshView()
+void OverviewView::scaleAndCenter()
 {
     current_scale = (qreal)viewport()->width() / width;
     qreal h_scale = (qreal)viewport()->height() / height;
@@ -34,6 +34,11 @@ void OverviewView::refreshView()
         current_scale = h_scale;
     }
     center();
+}
+
+void OverviewView::refreshView()
+{
+    scaleAndCenter();
     viewport()->update();
 }
 
@@ -94,6 +99,7 @@ void OverviewView::mousePressEvent(QMouseEvent *event)
     qreal x = event->localPos().x() - w / 2;
     qreal y = event->localPos().y() - h / 2;
     rangeRect = QRectF(x, y, w, h);
+    useCache = true;
     viewport()->update();
     emit mouseMoved();
     mouseContainsRect(event);
@@ -113,6 +119,7 @@ void OverviewView::mouseMoveEvent(QMouseEvent *event)
     qreal x = event->localPos().x() - initialDiff.x();
     qreal y = event->localPos().y() - initialDiff.y();
     rangeRect = QRectF(x, y, rangeRect.width(), rangeRect.height());
+    useCache = true;
     viewport()->update();
     emit mouseMoved();
 }
diff --git a/src/widgets/OverviewView.h b/src/widgets/OverviewView.h
index 782ce085..21848432 100644
--- a/src/widgets/OverviewView.h
+++ b/src/widgets/OverviewView.h
@@ -36,7 +36,7 @@ public:
 
 public slots:
     /**
-     * @brief refresh the view and adjust the scale
+     * @brief scale and center all nodes in, then run update
      */
     void refreshView();
 
@@ -79,6 +79,11 @@ private:
      */
     QPointF initialDiff;
 
+    /**
+     * @brief calculate the scale to fit the all nodes in and center them in the viewport
+     */
+    void scaleAndCenter();
+
     /**
      * @brief draw the computed blocks passed by Graph
      */