diff --git a/src/visual/MeterCanvas.cpp b/src/visual/MeterCanvas.cpp
index 3014f8f..bb3c20b 100644
--- a/src/visual/MeterCanvas.cpp
+++ b/src/visual/MeterCanvas.cpp
@@ -60,6 +60,9 @@ 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);
diff --git a/src/visual/ModeSelectorCanvas.cpp b/src/visual/ModeSelectorCanvas.cpp
index f067d6d..52637ba 100644
--- a/src/visual/ModeSelectorCanvas.cpp
+++ b/src/visual/ModeSelectorCanvas.cpp
@@ -47,7 +47,10 @@ int ModeSelectorCanvas::getHoveredSelection() {
 
 void ModeSelectorCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
     wxPaintDC dc(this);
-    const wxSize ClientSize = GetClientSize();
+#ifdef __APPLE__    // force half-rate?
+    glFinish();
+#endif
+   const wxSize ClientSize = GetClientSize();
 
     glContext->SetCurrent(*this);
     initGLExtensions();
diff --git a/src/visual/ScopeCanvas.cpp b/src/visual/ScopeCanvas.cpp
index dc2a972..cc8c000 100644
--- a/src/visual/ScopeCanvas.cpp
+++ b/src/visual/ScopeCanvas.cpp
@@ -45,6 +45,9 @@ void ScopeCanvas::setDeviceName(std::string device_name) {
 
 void ScopeCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
     wxPaintDC dc(this);
+#ifdef __APPLE__    // force half-rate?
+    glFinish();
+#endif
     const wxSize ClientSize = GetClientSize();
 
     if (!wxGetApp().getAudioVisualQueue()->empty()) {
diff --git a/src/visual/SpectrumCanvas.cpp b/src/visual/SpectrumCanvas.cpp
index f894f0f..e88733a 100644
--- a/src/visual/SpectrumCanvas.cpp
+++ b/src/visual/SpectrumCanvas.cpp
@@ -67,6 +67,9 @@ SpectrumCanvas::~SpectrumCanvas() {
 
 void SpectrumCanvas::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/TuningCanvas.cpp b/src/visual/TuningCanvas.cpp
index dab1aaf..8a2574f 100644
--- a/src/visual/TuningCanvas.cpp
+++ b/src/visual/TuningCanvas.cpp
@@ -36,6 +36,9 @@ TuningCanvas::~TuningCanvas() {
 
 void TuningCanvas::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/WaterfallCanvas.cpp b/src/visual/WaterfallCanvas.cpp
index 10e0fcc..8669667 100644
--- a/src/visual/WaterfallCanvas.cpp
+++ b/src/visual/WaterfallCanvas.cpp
@@ -98,6 +98,10 @@ 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();