diff --git a/src/AppFrame.cpp b/src/AppFrame.cpp
index 4463da5..66291dd 100644
--- a/src/AppFrame.cpp
+++ b/src/AppFrame.cpp
@@ -35,10 +35,11 @@ EVT_CLOSE(AppFrame::OnClose)
 EVT_MENU(wxID_ANY, AppFrame::OnMenu)
 EVT_COMMAND(wxID_ANY, wxEVT_THREAD, AppFrame::OnThread)
 EVT_IDLE(AppFrame::OnIdle)
+EVT_TIMER(FRAME_TIMER_ID, AppFrame::OnTimer)
 wxEND_EVENT_TABLE()
 
 AppFrame::AppFrame() :
-        wxFrame(NULL, wxID_ANY, CUBICSDR_TITLE), activeDemodulator(NULL) {
+        wxFrame(NULL, wxID_ANY, CUBICSDR_TITLE), activeDemodulator(NULL), frame_timer(this, FRAME_TIMER_ID) {
 
 #ifdef __linux__
     SetIcon(wxICON(cubicsdr));
@@ -350,6 +351,7 @@ AppFrame::AppFrame() :
     wxAcceleratorTable accel(3, entries);
     SetAcceleratorTable(accel);
 
+    frame_timer.Start(30);
 //    static const int attribs[] = { WX_GL_RGBA, WX_GL_DOUBLEBUFFER, 0 };
 //    wxLogStatus("Double-buffered display %s supported", wxGLCanvas::IsDisplaySupported(attribs) ? "is" : "not");
 //    ShowFullScreen(true);
@@ -561,6 +563,10 @@ void AppFrame::OnThread(wxCommandEvent& event) {
 }
 
 void AppFrame::OnIdle(wxIdleEvent& event) {
+    event.Skip();
+}
+
+void AppFrame::OnTimer(wxTimerEvent& event) {
 
     DemodulatorInstance *demod = wxGetApp().getDemodMgr().getLastActiveDemodulator();
 
@@ -691,6 +697,26 @@ void AppFrame::OnIdle(wxIdleEvent& event) {
     dproc->setCenterFrequency(demodWaterfallCanvas->getCenterFrequency());
     
     dproc->run();
+
+    scopeCanvas->Refresh();
+    
+    waterfallCanvas->Refresh();
+    spectrumCanvas->Refresh();
+    
+    demodWaterfallCanvas->Refresh();
+    demodSpectrumCanvas->Refresh();
+    
+    demodSignalMeter->Refresh();
+
+    if (demodTuner->getMouseTracker()->mouseInView() || demodTuner->changed()) {
+        demodTuner->Refresh();
+    }
+    if (demodModeSelector->getMouseTracker()->mouseInView()) {
+        demodModeSelector->Refresh();
+    }
+    if (demodGainMeter->getMouseTracker()->mouseInView()) {
+        demodGainMeter->Refresh();
+    }
     
     event.Skip();
 }
diff --git a/src/AppFrame.h b/src/AppFrame.h
index 4d335a0..de90215 100644
--- a/src/AppFrame.h
+++ b/src/AppFrame.h
@@ -50,7 +50,7 @@
 #define wxID_AUDIO_BANDWIDTH_BASE 9000
 #define wxID_AUDIO_DEVICE_MULTIPLIER 50
 
-
+#define FRAME_TIMER_ID 1000
 
 // Define a new frame type
 class AppFrame: public wxFrame {
@@ -69,6 +69,7 @@ private:
     void OnClose(wxCloseEvent& event);
     void OnNewWindow(wxCommandEvent& event);
     void OnIdle(wxIdleEvent& event);
+    void OnTimer(wxTimerEvent& event);
 
     ScopeCanvas *scopeCanvas;
     SpectrumCanvas *spectrumCanvas;
@@ -93,6 +94,7 @@ private:
     wxMenuItem *iqSwapMenuItem;
     
     std::string currentSessionFile;
-
+    wxTimer frame_timer;
+    
     wxDECLARE_EVENT_TABLE();
 };
diff --git a/src/ui/UITestCanvas.cpp b/src/ui/UITestCanvas.cpp
index e94a993..e3bf7d2 100644
--- a/src/ui/UITestCanvas.cpp
+++ b/src/ui/UITestCanvas.cpp
@@ -36,9 +36,6 @@ UITestCanvas::~UITestCanvas() {
 
 void UITestCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
     wxPaintDC dc(this);
-#ifdef __APPLE__    // force half-rate?
-    glFinish();
-#endif
     const wxSize ClientSize = GetClientSize();
     
     glContext->SetCurrent(*this);
diff --git a/src/visual/MeterCanvas.cpp b/src/visual/MeterCanvas.cpp
index bb3c20b..423fc20 100644
--- a/src/visual/MeterCanvas.cpp
+++ b/src/visual/MeterCanvas.cpp
@@ -60,9 +60,6 @@ float MeterCanvas::getInputValue() {
 
 void MeterCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
     wxPaintDC dc(this);
-#ifdef __APPLE__    // force half-rate?
-    glFinish();
-#endif
     const wxSize ClientSize = GetClientSize();
 
     glContext->SetCurrent(*this);
@@ -82,7 +79,7 @@ void MeterCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
 }
 
 void MeterCanvas::OnIdle(wxIdleEvent &event) {
-    Refresh(false);
+    event.Skip();
 }
 
 void MeterCanvas::OnMouseMoved(wxMouseEvent& event) {
@@ -115,6 +112,7 @@ void MeterCanvas::OnMouseReleased(wxMouseEvent& event) {
 void MeterCanvas::OnMouseLeftWindow(wxMouseEvent& event) {
     InteractiveCanvas::OnMouseLeftWindow(event);
     SetCursor(wxCURSOR_CROSS);
+    Refresh();
 }
 
 void MeterCanvas::OnMouseEnterWindow(wxMouseEvent& event) {
diff --git a/src/visual/ModeSelectorCanvas.cpp b/src/visual/ModeSelectorCanvas.cpp
index 1b859e3..98172b5 100644
--- a/src/visual/ModeSelectorCanvas.cpp
+++ b/src/visual/ModeSelectorCanvas.cpp
@@ -47,10 +47,7 @@ int ModeSelectorCanvas::getHoveredSelection() {
 
 void ModeSelectorCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
     wxPaintDC dc(this);
-#ifdef __APPLE__    // force half-rate?
-    glFinish();
-#endif
-   const wxSize ClientSize = GetClientSize();
+    const wxSize ClientSize = GetClientSize();
 
     glContext->SetCurrent(*this);
     initGLExtensions();
@@ -75,7 +72,7 @@ void ModeSelectorCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
 }
 
 void ModeSelectorCanvas::OnIdle(wxIdleEvent &event) {
-    Refresh(false);
+    event.Skip();
 }
 
 void ModeSelectorCanvas::OnMouseMoved(wxMouseEvent& event) {
@@ -109,6 +106,7 @@ void ModeSelectorCanvas::OnMouseReleased(wxMouseEvent& event) {
 void ModeSelectorCanvas::OnMouseLeftWindow(wxMouseEvent& event) {
     InteractiveCanvas::OnMouseLeftWindow(event);
     SetCursor (wxCURSOR_CROSS);
+    Refresh();
 }
 
 void ModeSelectorCanvas::OnMouseEnterWindow(wxMouseEvent& event) {
diff --git a/src/visual/ScopeCanvas.cpp b/src/visual/ScopeCanvas.cpp
index 5c6bd54..88d6a33 100644
--- a/src/visual/ScopeCanvas.cpp
+++ b/src/visual/ScopeCanvas.cpp
@@ -50,9 +50,6 @@ bool ScopeCanvas::getPPMMode() {
 
 void ScopeCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
     wxPaintDC dc(this);
-#ifdef __APPLE__    // force half-rate?
-    glFinish();
-#endif
     const wxSize ClientSize = GetClientSize();
 
     wxGetApp().getScopeProcessor()->run();
@@ -94,7 +91,7 @@ void ScopeCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
 }
 
 void ScopeCanvas::OnIdle(wxIdleEvent &event) {
-    Refresh(false);
+    event.Skip();
 }
 
 ScopeRenderDataQueue *ScopeCanvas::getInputQueue() {
diff --git a/src/visual/SpectrumCanvas.cpp b/src/visual/SpectrumCanvas.cpp
index e618cc5..5052f24 100644
--- a/src/visual/SpectrumCanvas.cpp
+++ b/src/visual/SpectrumCanvas.cpp
@@ -42,26 +42,22 @@ SpectrumCanvas::~SpectrumCanvas() {
 
 void SpectrumCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
     wxPaintDC dc(this);
-#ifdef __APPLE__    // force half-rate?
-    glFinish();
-#endif
     const wxSize ClientSize = GetClientSize();
     
-    if (visualDataQueue.empty()) {
-        return;
+    if (!visualDataQueue.empty()) {
+        SpectrumVisualData *vData;
+        
+        visualDataQueue.pop(vData);
+        
+        if (!vData) {
+            return;
+        }
+        
+        spectrum_points.assign(vData->spectrum_points.begin(),vData->spectrum_points.end());
+        
+        vData->decRefCount();
     }
     
-    SpectrumVisualData *vData;
-    
-    visualDataQueue.pop(vData);
-    
-    if (!vData) {
-        return;
-    }
-    
-    spectrum_points.assign(vData->spectrum_points.begin(),vData->spectrum_points.end());
-    
-    vData->decRefCount();
     
     glContext->SetCurrent(*this);
     initGLExtensions();
@@ -84,7 +80,7 @@ void SpectrumCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
 
 
 void SpectrumCanvas::OnIdle(wxIdleEvent &event) {
-    Refresh(false);
+    event.Skip();
 }
 
 
diff --git a/src/visual/TuningCanvas.cpp b/src/visual/TuningCanvas.cpp
index daed27e..cb618f6 100644
--- a/src/visual/TuningCanvas.cpp
+++ b/src/visual/TuningCanvas.cpp
@@ -31,7 +31,7 @@ EVT_KEY_UP(TuningCanvas::OnKeyUp)
 wxEND_EVENT_TABLE()
 
 TuningCanvas::TuningCanvas(wxWindow *parent, int *attribList) :
-        InteractiveCanvas(parent, attribList), dragAccum(0), uxDown(0), top(false), bottom(false) {
+        InteractiveCanvas(parent, attribList), dragAccum(0), uxDown(0), top(false), bottom(false), freq(-1), bw(-1), center(-1) {
 
     glContext = new TuningContext(this, &wxGetApp().GetContext(this));
 
@@ -57,13 +57,27 @@ TuningCanvas::~TuningCanvas() {
 
 }
 
+bool TuningCanvas::changed() {
+    DemodulatorInstance *activeDemod = wxGetApp().getDemodMgr().getLastActiveDemodulator();
+    
+    long long current_freq = 0;
+    if (activeDemod != NULL) {
+        freq = activeDemod->getFrequency();
+    }
+    long long current_bw = wxGetApp().getDemodMgr().getLastBandwidth();
+    long long current_center = wxGetApp().getFrequency();
+    
+    if (current_freq != freq || current_bw != bw || current_center != center) {
+        return true;
+    }
+    
+    return false;
+}
+
 void TuningCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
     wxPaintDC dc(this);
-#ifdef __APPLE__    // force half-rate?
-    glFinish();
-#endif
     const wxSize ClientSize = GetClientSize();
-
+    
     glContext->SetCurrent(*this);
     initGLExtensions();
     glViewport(0, 0, ClientSize.x, ClientSize.y);
@@ -71,13 +85,13 @@ void TuningCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
     glContext->DrawBegin();
 
     DemodulatorInstance *activeDemod = wxGetApp().getDemodMgr().getLastActiveDemodulator();
-
-    long long freq = 0;
+    
+    freq = 0;
     if (activeDemod != NULL) {
         freq = activeDemod->getFrequency();
     }
-    long long bw = wxGetApp().getDemodMgr().getLastBandwidth();
-    long long center = wxGetApp().getFrequency();
+    bw = wxGetApp().getDemodMgr().getLastBandwidth();
+    center = wxGetApp().getFrequency();
 
     if (mouseTracker.mouseDown()) {
         glContext->Draw(ThemeMgr::mgr.currentTheme->tuningBarDark.r, ThemeMgr::mgr.currentTheme->tuningBarDark.g, ThemeMgr::mgr.currentTheme->tuningBarDark.b,
@@ -238,8 +252,6 @@ void TuningCanvas::OnIdle(wxIdleEvent &event) {
             dragging = false;
         }
     }
-
-    Refresh(false);
 }
 
 void TuningCanvas::OnMouseMoved(wxMouseEvent& event) {
@@ -373,6 +385,7 @@ void TuningCanvas::OnMouseLeftWindow(wxMouseEvent& event) {
     if (currentPPM != lastPPM) {
         wxGetApp().saveConfig();
     }
+    Refresh();
 }
 
 void TuningCanvas::OnMouseEnterWindow(wxMouseEvent& event) {
diff --git a/src/visual/TuningCanvas.h b/src/visual/TuningCanvas.h
index 1fea2e2..2826363 100644
--- a/src/visual/TuningCanvas.h
+++ b/src/visual/TuningCanvas.h
@@ -22,7 +22,8 @@ public:
     ~TuningCanvas();
 
     void setHelpTip(std::string tip);
-
+    bool changed();
+    
 private:
     void OnPaint(wxPaintEvent& event);
     void OnIdle(wxIdleEvent &event);
@@ -66,6 +67,7 @@ private:
     int currentPPM;
     int lastPPM;
 
+    long long freq, bw, center;
     //
 wxDECLARE_EVENT_TABLE();
 };
diff --git a/src/visual/WaterfallCanvas.cpp b/src/visual/WaterfallCanvas.cpp
index 7fe2011..be6639e 100644
--- a/src/visual/WaterfallCanvas.cpp
+++ b/src/visual/WaterfallCanvas.cpp
@@ -70,9 +70,6 @@ void WaterfallCanvas::attachSpectrumCanvas(SpectrumCanvas *canvas_in) {
 
 void WaterfallCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
     wxPaintDC dc(this);
-#ifdef __APPLE__    // force half-rate?
-    glFinish();
-#endif
 
     const wxSize ClientSize = GetClientSize();
     long double currentZoom = zoom;
@@ -139,28 +136,29 @@ void WaterfallCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
         }
     }
 
-    if (visualDataQueue.empty()) {
-        return;
+    bool step = false;
+    if (!visualDataQueue.empty()) {
+        SpectrumVisualData *vData;
+        
+        visualDataQueue.pop(vData);
+        
+        if (!vData) {
+            return;
+        }
+        
+        spectrum_points.assign(vData->spectrum_points.begin(),vData->spectrum_points.end());
+        
+        vData->decRefCount();
+        step = true;
     }
     
-    SpectrumVisualData *vData;
-    
-    visualDataQueue.pop(vData);
-    
-    if (!vData) {
-        return;
-    }
-    
-    spectrum_points.assign(vData->spectrum_points.begin(),vData->spectrum_points.end());
-    
-    vData->decRefCount();
     
     glContext->SetCurrent(*this);
     initGLExtensions();
     glViewport(0, 0, ClientSize.x, ClientSize.y);
 
     glContext->BeginDraw(0,0,0);
-    glContext->Draw(spectrum_points);
+    glContext->Draw(spectrum_points, step);
 
     std::vector<DemodulatorInstance *> &demods = wxGetApp().getDemodMgr().getDemodulators();
 
@@ -352,7 +350,7 @@ void WaterfallCanvas::OnKeyDown(wxKeyEvent& event) {
     }
 }
 void WaterfallCanvas::OnIdle(wxIdleEvent &event) {
-    Refresh(false);
+    event.Skip();
 }
 
 void WaterfallCanvas::OnMouseMoved(wxMouseEvent& event) {
diff --git a/src/visual/WaterfallContext.cpp b/src/visual/WaterfallContext.cpp
index 733cfc9..8ba0f45 100644
--- a/src/visual/WaterfallContext.cpp
+++ b/src/visual/WaterfallContext.cpp
@@ -36,7 +36,7 @@ void WaterfallContext::refreshTheme() {
     }
 }
 
-void WaterfallContext::Draw(std::vector<float> &points) {
+void WaterfallContext::Draw(std::vector<float> &points, bool step) {
 
     int half_fft_size = fft_size / 2;
 
diff --git a/src/visual/WaterfallContext.h b/src/visual/WaterfallContext.h
index f42b5f9..e993747 100644
--- a/src/visual/WaterfallContext.h
+++ b/src/visual/WaterfallContext.h
@@ -10,7 +10,7 @@ class WaterfallContext: public PrimaryGLContext {
 public:
     WaterfallContext(WaterfallCanvas *canvas, wxGLContext *sharedContext);
 
-    void Draw(std::vector<float> &points);
+    void Draw(std::vector<float> &points, bool step);
     void Setup(int fft_size_in, int num_waterfall_lines_in);
     void refreshTheme();