diff --git a/zxlive/graphview.py b/zxlive/graphview.py
index b4415956..ad132d05 100644
--- a/zxlive/graphview.py
+++ b/zxlive/graphview.py
@@ -80,6 +80,8 @@ def __init__(self, graph_scene: GraphScene) -> None:
         # self.setResizeAnchor(QGraphicsView.ViewportAnchor.AnchorViewCenter)
         self.setResizeAnchor(QGraphicsView.ViewportAnchor.AnchorUnderMouse)
         #self.setDragMode(QGraphicsView.DragMode.ScrollHandDrag) # This has to be enabled based on keyboard shortcuts
+        self.setCacheMode(QGraphicsView.CacheModeFlag.CacheBackground);
+        self.setViewportUpdateMode(QGraphicsView.ViewportUpdateMode.BoundingRectViewportUpdate);
 
         # We implement the rubberband logic ourselves. Note that there is also
         # the option to set `self.setDragMode(QGraphicsView.RubberBandDrag)`,
diff --git a/zxlive/vitem.py b/zxlive/vitem.py
index f7afc6d7..ca4d2fab 100644
--- a/zxlive/vitem.py
+++ b/zxlive/vitem.py
@@ -168,6 +168,7 @@ def refresh(self) -> None:
                 brush.setStyle(Qt.BrushStyle.Dense1Pattern)
                 self.setBrush(brush)
                 pen.setColor(colors.boundary_pressed)
+            self.prepareGeometryChange()
             self.setPen(pen)
 
         if self.phase_item: