diff --git a/aegisub/src/video_display.cpp b/aegisub/src/video_display.cpp
index 310d37656..480ecddf0 100644
--- a/aegisub/src/video_display.cpp
+++ b/aegisub/src/video_display.cpp
@@ -488,7 +488,6 @@ void VideoDisplay::OnMouseEvent(wxMouseEvent& event) {
 
 	tool->OnMouseEvent(event);
 	ShowCursor(activeMode != Video_Mode_Standard);
-	Render();
 }
 void VideoDisplay::OnKey(wxKeyEvent &event) {
 	int key = event.GetKeyCode();
diff --git a/aegisub/src/visual_tool.cpp b/aegisub/src/visual_tool.cpp
index 4baa5ddef..d8112d886 100644
--- a/aegisub/src/visual_tool.cpp
+++ b/aegisub/src/visual_tool.cpp
@@ -105,9 +105,11 @@ VisualTool<FeatureType>::~VisualTool() {
 template<class FeatureType>
 void VisualTool<FeatureType>::OnMouseEvent (wxMouseEvent &event) {
 	bool realTime = realtime->GetBool();
+	bool needRender = false;
 
 	if (event.Leaving()) {
 		Update();
+		parent->Render();
 		return;
 	}
 	externalChange = false;
@@ -127,7 +129,9 @@ void VisualTool<FeatureType>::OnMouseEvent (wxMouseEvent &event) {
 		dragListOK = true;
 	}
 	if (!dragging) {
+		int oldHigh = curFeatureI;
 		GetHighlightedFeature();
+		if (curFeatureI != oldHigh) needRender = true;
 	}
 
 	if (dragging) {
@@ -150,7 +154,12 @@ void VisualTool<FeatureType>::OnMouseEvent (wxMouseEvent &event) {
 					CommitDrag(&features[*cur]);
 				}
 			}
-			if (realTime) Commit();
+			if (realTime) {
+				Commit();
+			}
+			else {
+				needRender = true;
+			}
 		}
 		// end drag
 		else {
@@ -195,6 +204,9 @@ void VisualTool<FeatureType>::OnMouseEvent (wxMouseEvent &event) {
 				CommitHold();
 				Commit();
 			}
+			else {
+				needRender = true;
+			}
 		}
 		// end hold
 		else {
@@ -242,6 +254,7 @@ void VisualTool<FeatureType>::OnMouseEvent (wxMouseEvent &event) {
 			if (!altDown) {
 				ClearSelection();
 				SetEditbox();
+				needRender = true;
 			}
 			curDiag = GetActiveDialogueLine();
 			if (curDiag && InitializeHold()) {
@@ -252,7 +265,7 @@ void VisualTool<FeatureType>::OnMouseEvent (wxMouseEvent &event) {
 		}
 	}
 
-	Update();
+	if (Update() || needRender) parent->Render();
 	externalChange = true;
 }
 
diff --git a/aegisub/src/visual_tool.h b/aegisub/src/visual_tool.h
index 7cd0fa034..2276ea4f8 100644
--- a/aegisub/src/visual_tool.h
+++ b/aegisub/src/visual_tool.h
@@ -67,7 +67,7 @@ protected:
 public:
 	virtual void OnMouseEvent(wxMouseEvent &event)=0;
 	virtual void OnSubTool(wxCommandEvent &)=0;
-	virtual void Update()=0;
+	virtual bool Update()=0;
 	virtual void Draw()=0;
 	virtual void Refresh()=0;
 	virtual ~IVisualTool() { };
@@ -194,7 +194,8 @@ public:
 	/// @brief Event handler for the subtoolbar
 	virtual void OnSubTool(wxCommandEvent &) { }
 	/// @brief Called when there's stuff
-	virtual void Update() { };
+	/// @return Should the display rerender?
+	virtual bool Update() { return false; };
 	/// @brief Draw stuff
 	virtual void Draw()=0;
 	/// @brief Called by stuff when there's stuff
diff --git a/aegisub/src/visual_tool_cross.cpp b/aegisub/src/visual_tool_cross.cpp
index ead913482..62e51a1f6 100644
--- a/aegisub/src/visual_tool_cross.cpp
+++ b/aegisub/src/visual_tool_cross.cpp
@@ -52,11 +52,11 @@ VisualToolCross::VisualToolCross(VideoDisplay *parent, VideoState const& video,
 VisualToolCross::~VisualToolCross() { }
 
 /// @brief Update 
-void VisualToolCross::Update() {
-	if (!leftDClick) return;
+bool VisualToolCross::Update() {
+	if (!leftDClick) return true;
 
 	AssDialogue* line = GetActiveDialogueLine();
-	if (!line) return;
+	if (!line) return true;
 
 
 	int dx, dy;
@@ -80,6 +80,7 @@ void VisualToolCross::Update() {
 	}
 
 	Commit(true, _("positioning"));
+	return false;
 }
 
 /// @brief Draw 
diff --git a/aegisub/src/visual_tool_cross.h b/aegisub/src/visual_tool_cross.h
index f67b25fde..de441e7f9 100644
--- a/aegisub/src/visual_tool_cross.h
+++ b/aegisub/src/visual_tool_cross.h
@@ -48,7 +48,7 @@ public:
 	VisualToolCross(VideoDisplay *parent, VideoState const& video, wxToolBar *);
 	~VisualToolCross();
 
-	void Update();
+	bool Update();
 	void Draw();
 };
 
diff --git a/aegisub/src/visual_tool_drag.cpp b/aegisub/src/visual_tool_drag.cpp
index f21e8cbc1..16c8356c6 100644
--- a/aegisub/src/visual_tool_drag.cpp
+++ b/aegisub/src/visual_tool_drag.cpp
@@ -308,8 +308,8 @@ void VisualToolDrag::CommitDrag(VisualToolDragDraggableFeature* feature) {
 		SetOverride(feature->line, L"\\move", wxString::Format(L"(%i,%i,%i,%i,%i,%i)", x1, y1, x2, y2, feature->time, p->time));
 	}
 }
-void VisualToolDrag::Update() {
-	if (!leftDClick) return;
+bool VisualToolDrag::Update() {
+	if (!leftDClick) return false;
 
 	int dx, dy;
 	int vx = video.x;
@@ -321,7 +321,7 @@ void VisualToolDrag::Update() {
 	}
 	else {
 		AssDialogue* line = GetActiveDialogueLine();
-		if (!line) return;
+		if (!line) return false;
 		GetLinePosition(line, dx, dy);
 	}
 	parent->ToScriptCoords(&dx, &dy);
@@ -359,4 +359,5 @@ void VisualToolDrag::Update() {
 	Commit(true, _("positioning"));
 
 	GenerateFeatures();
+	return false;
 }
diff --git a/aegisub/src/visual_tool_drag.h b/aegisub/src/visual_tool_drag.h
index 74ce2fd52..dde2e3289 100644
--- a/aegisub/src/visual_tool_drag.h
+++ b/aegisub/src/visual_tool_drag.h
@@ -88,6 +88,6 @@ public:
 	void OnSelectionChange(bool clear, int row, bool selected);
 
 	void Draw();
-	void Update();
+	bool Update();
 	void OnSubTool(wxCommandEvent &event);
 };
diff --git a/aegisub/src/visual_tool_rotatez.h b/aegisub/src/visual_tool_rotatez.h
index da3439a90..0a61a16e3 100644
--- a/aegisub/src/visual_tool_rotatez.h
+++ b/aegisub/src/visual_tool_rotatez.h
@@ -88,4 +88,5 @@ public:
 	VisualToolRotateZ(VideoDisplay *parent, VideoState const& video, wxToolBar *);
 
 	void Draw();
+	bool Update() { return true; }
 };