diff --git a/app/CMakeLists.txt b/app/CMakeLists.txt
index b22b69ced..4998e2a99 100644
--- a/app/CMakeLists.txt
+++ b/app/CMakeLists.txt
@@ -94,6 +94,7 @@ if(MSVC)
     /external:anglebrackets
     /external:W0
     "$<$<CONFIG:RELEASE>:/O2>"
+    "$<$<COMPILE_LANGUAGE:CXX>:/MP>"
   )
 else()
   target_compile_options(
@@ -110,7 +111,7 @@ else()
 endif()
 
 if(UNIX AND NOT APPLE)
-  target_compile_options(
+  target_link_options(
     ${OLIVE_TARGET}
     PRIVATE
     -rdynamic
@@ -155,6 +156,12 @@ if (WIN32)
     PRIVATE
     DbgHelp
   )
+elseif (APPLE)
+  target_link_libraries(
+    ${OLIVE_TARGET}
+    PRIVATE
+    "-framework ApplicationServices"
+  )
 endif()
 
 set(OLIVE_TS_FILES
diff --git a/app/config/config.cpp b/app/config/config.cpp
index c6e26a454..e3024ee18 100644
--- a/app/config/config.cpp
+++ b/app/config/config.cpp
@@ -98,8 +98,8 @@ void Config::SetDefaults()
 
   config_map_["DiskCachePath"] = QStandardPaths::writableLocation(QStandardPaths::AppLocalDataLocation);
   config_map_["DiskCacheSize"] = 20.0;
-  config_map_["DiskCacheBehind"] = QVariant::fromValue(rational(2));
-  config_map_["DiskCacheAhead"] = QVariant::fromValue(rational(10));
+  config_map_["DiskCacheBehind"] = QVariant::fromValue(rational(1));
+  config_map_["DiskCacheAhead"] = QVariant::fromValue(rational(5));
   config_map_["ClearDiskCacheOnClose"] = false;
 
   config_map_["DefaultSequenceWidth"] = 1920;
diff --git a/app/dialog/footageproperties/footageproperties.cpp b/app/dialog/footageproperties/footageproperties.cpp
index 3fe507906..484127021 100644
--- a/app/dialog/footageproperties/footageproperties.cpp
+++ b/app/dialog/footageproperties/footageproperties.cpp
@@ -109,7 +109,7 @@ FootagePropertiesDialog::FootagePropertiesDialog(QWidget *parent, Footage *foota
 
   // Auto-select first item that actually has properties
   if (first_usable_stream >= 0) {
-    track_list->item(first_usable_stream)->setSelected(true);
+    track_list->setCurrentRow(first_usable_stream);
   }
   track_list->setFocus();
 }
diff --git a/app/dialog/projectproperties/projectproperties.cpp b/app/dialog/projectproperties/projectproperties.cpp
index e8dc50195..7f90d2bd2 100644
--- a/app/dialog/projectproperties/projectproperties.cpp
+++ b/app/dialog/projectproperties/projectproperties.cpp
@@ -44,10 +44,12 @@ ProjectPropertiesDialog::ProjectPropertiesDialog(Project* p, QWidget *parent) :
 
   setWindowTitle(tr("Project Properties for '%1'").arg(working_project_->name()));
 
+  QTabWidget* tabs = new QTabWidget;
+  layout->addWidget(tabs);
+
   {
     // Color management group
-    QGroupBox* color_group = new QGroupBox();
-    color_group->setTitle(tr("Color Management"));
+    QWidget* color_group = new QWidget();
 
     QGridLayout* color_layout = new QGridLayout(color_group);
 
@@ -72,18 +74,19 @@ ProjectPropertiesDialog::ProjectPropertiesDialog(Project* p, QWidget *parent) :
     color_layout->addWidget(browse_btn, 0, 2);
     connect(browse_btn, &QPushButton::clicked, this, &ProjectPropertiesDialog::BrowseForOCIOConfig);
 
-    layout->addWidget(color_group);
-
     ocio_filename_->setText(working_project_->color_manager()->GetConfigFilename());
 
     connect(ocio_filename_, &QLineEdit::textChanged, this, &ProjectPropertiesDialog::OCIOFilenameUpdated);
     OCIOFilenameUpdated();
+
+    tabs->addTab(color_group, tr("Color Management"));
   }
 
+  
+
   {
     // Paths group
-    QGroupBox* paths_group = new QGroupBox();
-    paths_group->setTitle(tr("Paths"));
+    QWidget* paths_group = new QWidget();
 
     QGridLayout* paths_layout = new QGridLayout(paths_group);
 
@@ -104,7 +107,7 @@ ProjectPropertiesDialog::ProjectPropertiesDialog(Project* p, QWidget *parent) :
     paths_layout->addWidget(proxy_path_->browse_btn(), row, 2);
     paths_layout->addWidget(proxy_path_->default_box(), row, 3);
 
-    layout->addWidget(paths_group);
+    tabs->addTab(paths_group, tr("Paths"));
   }
 
   QDialogButtonBox* dialog_btns = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel,
diff --git a/app/render/backend/audiorenderbackend.cpp b/app/render/backend/audiorenderbackend.cpp
index 9e819c0c8..368d70195 100644
--- a/app/render/backend/audiorenderbackend.cpp
+++ b/app/render/backend/audiorenderbackend.cpp
@@ -124,7 +124,7 @@ TimeRange AudioRenderBackend::PopNextFrameFromQueue()
   return range;
 }
 
-void AudioRenderBackend::InvalidateCacheInternal(const rational &start_range, const rational &end_range)
+void AudioRenderBackend::InvalidateCacheInternal(const rational &start_range, const rational &end_range, bool only_visible)
 {
   if (!ic_from_conform_) {
     // Cancel any ranges waiting on a conform here since obviously the contents have changed
@@ -153,7 +153,7 @@ void AudioRenderBackend::InvalidateCacheInternal(const rational &start_range, co
     }
   }
 
-  RenderBackend::InvalidateCacheInternal(start_range, end_range);
+  RenderBackend::InvalidateCacheInternal(start_range, end_range, only_visible);
 }
 
 void AudioRenderBackend::ListenForConformSignal(AudioStreamPtr s)
diff --git a/app/render/backend/audiorenderbackend.h b/app/render/backend/audiorenderbackend.h
index ef6e6a090..6c6dd04f2 100644
--- a/app/render/backend/audiorenderbackend.h
+++ b/app/render/backend/audiorenderbackend.h
@@ -67,7 +67,7 @@ protected:
 
   virtual TimeRange PopNextFrameFromQueue() override;
 
-  virtual void InvalidateCacheInternal(const rational &start_range, const rational &end_range) override;
+  virtual void InvalidateCacheInternal(const rational &start_range, const rational &end_range, bool only_visible) override;
 
 private:
   struct ConformWaitInfo {
diff --git a/app/render/backend/renderbackend.cpp b/app/render/backend/renderbackend.cpp
index 8a4acb21e..502f35916 100644
--- a/app/render/backend/renderbackend.cpp
+++ b/app/render/backend/renderbackend.cpp
@@ -259,6 +259,8 @@ void RenderBackend::CacheNext()
       SetWorkerBusyState(worker, true);
       cancel_dialog_->WorkerStarted();
 
+      WorkerAboutToStartEvent(worker);
+
       QMetaObject::invokeMethod(worker,
                                 "Render",
                                 Qt::QueuedConnection,
@@ -290,24 +292,14 @@ void RenderBackend::CancelQueue()
   cancel_dialog_->RunIfWorkersAreBusy();
 }
 
+void RenderBackend::InvalidateVisible(const TimeRange &range, NodeInput *from)
+{
+  InvalidateCacheVeryInternal(range, from, true);
+}
+
 void RenderBackend::InvalidateCache(const TimeRange &range, NodeInput *from)
 {
-  // Adjust range to min/max values
-  rational start_range_adj = qMax(rational(0), range.in());
-  rational end_range_adj = qMin(GetSequenceLength(), range.out());
-
-  qDebug() << "Cache invalidated between"
-           << start_range_adj.toDouble()
-           << "and"
-           << end_range_adj.toDouble();
-
-  if (from) {
-    // Queue value update
-    qDebug() << "  from" << from->parentNode()->id() << "::" << from->id();
-    QueueValueUpdate(from);
-  }
-
-  InvalidateCacheInternal(start_range_adj, end_range_adj);
+  InvalidateCacheVeryInternal(range, from, false);
 }
 
 bool RenderBackend::ViewerIsConnected() const
@@ -349,6 +341,26 @@ void RenderBackend::SetWorkerBusyState(RenderWorker *worker, bool busy)
   processor_busy_state_.replace(processors_.indexOf(worker), busy);
 }
 
+void RenderBackend::InvalidateCacheVeryInternal(const TimeRange &range, NodeInput *from, bool only_visible)
+{
+  // Adjust range to min/max values
+  rational start_range_adj = qMax(rational(0), range.in());
+  rational end_range_adj = qMin(GetSequenceLength(), range.out());
+
+  qDebug() << "Cache invalidated between"
+           << start_range_adj.toDouble()
+           << "and"
+           << end_range_adj.toDouble();
+
+  if (from) {
+    // Queue value update
+    qDebug() << "  from" << from->parentNode()->id() << "::" << from->id();
+    QueueValueUpdate(from);
+  }
+
+  InvalidateCacheInternal(start_range_adj, end_range_adj, only_visible);
+}
+
 void RenderBackend::CopyNodeInputValue(NodeInput *input)
 {
   // Find our copy of this parameter
@@ -446,8 +458,10 @@ const QVector<QThread *> &RenderBackend::threads()
   return threads_;
 }
 
-void RenderBackend::InvalidateCacheInternal(const rational &start_range, const rational &end_range)
+void RenderBackend::InvalidateCacheInternal(const rational &start_range, const rational &end_range, bool only_visible)
 {
+  Q_UNUSED(only_visible)
+
   // Add the range to the list
   cache_queue_.InsertTimeRange(TimeRange(start_range, end_range));
 
@@ -459,6 +473,11 @@ void RenderBackend::CacheIDChangedEvent(const QString &id)
   Q_UNUSED(id)
 }
 
+void RenderBackend::WorkerAboutToStartEvent(RenderWorker *worker)
+{
+  Q_UNUSED(worker)
+}
+
 void RenderBackend::InitWorkers()
 {
   for (int i=0;i<processors_.size();i++) {
diff --git a/app/render/backend/renderbackend.h b/app/render/backend/renderbackend.h
index 1431d00df..86659b750 100644
--- a/app/render/backend/renderbackend.h
+++ b/app/render/backend/renderbackend.h
@@ -51,6 +51,8 @@ public:
 
   void CancelQueue();
 
+  void InvalidateVisible(const TimeRange &range, NodeInput *from);
+
 public slots:
   void InvalidateCache(const TimeRange &range, NodeInput *from);
 
@@ -77,10 +79,12 @@ protected:
    */
   virtual bool GenerateCacheIDInternal(QCryptographicHash& hash) = 0;
 
-  virtual void InvalidateCacheInternal(const rational &start_range, const rational &end_range);
+  virtual void InvalidateCacheInternal(const rational &start_range, const rational &end_range, bool only_visible);
 
   virtual void CacheIDChangedEvent(const QString& id);
 
+  virtual void WorkerAboutToStartEvent(RenderWorker* worker);
+
   void SetError(const QString& error);
 
   virtual void ConnectViewer(ViewerOutput* node);
@@ -120,6 +124,8 @@ protected:
   NodeGraph copied_graph_;
 
 private:
+  void InvalidateCacheVeryInternal(const TimeRange &range, NodeInput *from, bool only_visible);
+
   void CopyNodeInputValue(NodeInput* input);
   Node *CopyNodeConnections(Node *src_node);
   void CopyNodeMakeConnection(NodeInput *src_input, NodeInput *dst_input);
diff --git a/app/render/backend/videorenderbackend.cpp b/app/render/backend/videorenderbackend.cpp
index db61fc0da..fee74005c 100644
--- a/app/render/backend/videorenderbackend.cpp
+++ b/app/render/backend/videorenderbackend.cpp
@@ -41,7 +41,8 @@ VideoRenderBackend::VideoRenderBackend(QObject *parent) :
   operating_mode_(VideoRenderWorker::kHashRenderCache),
   only_signal_last_frame_requested_(true),
   limit_caching_(true),
-  pop_toggle_(false)
+  pop_toggle_(false),
+  queue_is_visible_only_(false)
 {
   connect(DiskManager::instance(), &DiskManager::DeletedFrame, this, &VideoRenderBackend::FrameRemovedFromDiskCache);
 }
@@ -152,7 +153,7 @@ void VideoRenderBackend::ConnectWorkerToThis(RenderWorker *processor)
   connect(video_processor, &VideoRenderWorker::GeneratedFrame, this, &VideoRenderBackend::ThreadGeneratedFrame, Qt::QueuedConnection);
 }
 
-void VideoRenderBackend::InvalidateCacheInternal(const rational &start_range, const rational &end_range)
+void VideoRenderBackend::InvalidateCacheInternal(const rational &start_range, const rational &end_range, bool only_visible)
 {
   TimeRange invalidated(start_range, end_range);
 
@@ -160,7 +161,39 @@ void VideoRenderBackend::InvalidateCacheInternal(const rational &start_range, co
 
   emit RangeInvalidated(invalidated);
 
-  Requeue();
+  queue_is_visible_only_ = only_visible;
+
+  if (only_visible) {
+
+    // We're only caching this frame, and for maximum responsiveness, should cancel the rest of the
+    // queue
+    cache_queue_.clear();
+    cache_queue_.InsertTimeRange(TimeRange(start_range, end_range));
+
+    CacheNext();
+
+  } else {
+
+    // Rework the queue
+    Requeue();
+
+  }
+}
+
+void VideoRenderBackend::WorkerAboutToStartEvent(RenderWorker *worker)
+{
+  if (operating_mode_ & VideoRenderWorker::kDownloadOnly) {
+    int mode = operating_mode_;
+
+    if (queue_is_visible_only_) {
+      mode &= ~VideoRenderWorker::kDownloadOnly;
+    } else {
+      mode |= VideoRenderWorker::kDownloadOnly;
+    }
+
+    static_cast<VideoRenderWorker*>(worker)->
+        SetOperatingMode(static_cast<VideoRenderWorker::OperatingMode>(mode));
+  }
 }
 
 VideoRenderFrameCache *VideoRenderBackend::frame_cache()
@@ -201,9 +234,11 @@ QString VideoRenderBackend::GetCachedFrame(const rational &time)
 
 void VideoRenderBackend::UpdateLastRequestedTime(const rational &time)
 {
-  last_time_requested_ = time;
+  if (last_time_requested_ != time) {
+    last_time_requested_ = time;
 
-  Requeue();
+    Requeue();
+  }
 }
 
 NodeInput *VideoRenderBackend::GetDependentInput()
diff --git a/app/render/backend/videorenderbackend.h b/app/render/backend/videorenderbackend.h
index fe7bc6f1b..97b1f09f9 100644
--- a/app/render/backend/videorenderbackend.h
+++ b/app/render/backend/videorenderbackend.h
@@ -99,10 +99,12 @@ protected:
 
   virtual void ConnectWorkerToThis(RenderWorker* processor) override;
 
-  virtual void InvalidateCacheInternal(const rational &start_range, const rational &end_range) override;
+  virtual void InvalidateCacheInternal(const rational &start_range, const rational &end_range, bool only_visible) override;
 
   virtual void ParamsChangedEvent(){}
 
+  virtual void WorkerAboutToStartEvent(RenderWorker* worker) override;
+
   VideoRenderWorker::OperatingMode operating_mode_;
 
 signals:
@@ -135,6 +137,8 @@ private:
 
   bool pop_toggle_;
 
+  bool queue_is_visible_only_;
+
 private slots:
   void ThreadCompletedDownload(NodeDependency dep, qint64 job_time, QByteArray hash);
   void ThreadSkippedFrame(NodeDependency dep, qint64 job_time, QByteArray hash);
diff --git a/app/widget/slider/sliderlabel.cpp b/app/widget/slider/sliderlabel.cpp
index a54a54cf0..aee4a8409 100644
--- a/app/widget/slider/sliderlabel.cpp
+++ b/app/widget/slider/sliderlabel.cpp
@@ -22,6 +22,11 @@
 
 #include <QApplication>
 #include <QMouseEvent>
+#include <QDebug>
+
+#ifdef Q_OS_MAC
+#include <ApplicationServices/ApplicationServices.h>
+#endif
 
 OLIVE_NAMESPACE_ENTER
 
@@ -48,40 +53,51 @@ SliderLabel::SliderLabel(QWidget *parent) :
   setFocusPolicy(Qt::TabFocus);
 }
 
-void SliderLabel::mousePressEvent(QMouseEvent *ev)
+void SliderLabel::mousePressEvent(QMouseEvent *)
 {
-  QLabel::mousePressEvent(ev);
+  emit drag_start();
 
+#if defined(Q_OS_MAC)
+  CGAssociateMouseAndMouseCursorPosition(false);
+  CGDisplayHideCursor(kCGDirectMainDisplay);
+  CGGetLastMouseDelta(nullptr, nullptr);
+#else
   drag_start_ = QCursor::pos();
 
   static_cast<QGuiApplication*>(QApplication::instance())->setOverrideCursor(Qt::BlankCursor);
-
-  emit drag_start();
+#endif
 }
 
-void SliderLabel::mouseMoveEvent(QMouseEvent *ev)
+void SliderLabel::mouseMoveEvent(QMouseEvent *)
 {
-  QLabel::mouseMoveEvent(ev);
-
-  QPoint current_pos = QCursor::pos();
-
-  int x_mvmt = current_pos.x() - drag_start_.x();
-  int y_mvmt = drag_start_.y() - current_pos.y();
-
-  emit dragged(x_mvmt + y_mvmt);
+  int32_t x_mvmt, y_mvmt;
 
   // Keep cursor in the same position
+#if defined(Q_OS_MAC)
+  CGGetLastMouseDelta(&x_mvmt, &y_mvmt);
+#else
+  QPoint current_pos = QCursor::pos();
+
+  x_mvmt = current_pos.x() - drag_start_.x();
+  y_mvmt = drag_start_.y() - current_pos.y();
+
   QCursor::setPos(drag_start_);
+#endif
+
+  emit dragged(x_mvmt + y_mvmt);
 }
 
-void SliderLabel::mouseReleaseEvent(QMouseEvent *ev)
+void SliderLabel::mouseReleaseEvent(QMouseEvent *)
 {
-  QWidget::mouseReleaseEvent(ev);
+#if defined(Q_OS_MAC)
+  CGAssociateMouseAndMouseCursorPosition(true);
+  CGDisplayShowCursor(kCGDirectMainDisplay);
+#else
+  static_cast<QGuiApplication*>(QApplication::instance())->restoreOverrideCursor();
+#endif
 
   // Emit a clicked signal
   emit drag_stop();
-
-  static_cast<QGuiApplication*>(QApplication::instance())->restoreOverrideCursor();
 }
 
 void SliderLabel::focusInEvent(QFocusEvent *event)
diff --git a/app/widget/slider/sliderlabel.h b/app/widget/slider/sliderlabel.h
index 92771e669..c83e86bfc 100644
--- a/app/widget/slider/sliderlabel.h
+++ b/app/widget/slider/sliderlabel.h
@@ -54,6 +54,8 @@ signals:
 private:
   QPoint drag_start_;
 
+  bool cancel_mm_event_;
+
 };
 
 OLIVE_NAMESPACE_EXIT
diff --git a/app/widget/viewer/viewer.cpp b/app/widget/viewer/viewer.cpp
index 8fd2bab3a..292d07cc0 100644
--- a/app/widget/viewer/viewer.cpp
+++ b/app/widget/viewer/viewer.cpp
@@ -105,6 +105,7 @@ ViewerWidget::ViewerWidget(QWidget *parent) :
   connect(video_renderer_, &VideoRenderBackend::CachedTimeReady, this, &ViewerWidget::RendererCachedTime);
   connect(video_renderer_, &VideoRenderBackend::CachedTimeReady, ruler(), &TimeRuler::CacheTimeReady);
   connect(video_renderer_, &VideoRenderBackend::RangeInvalidated, ruler(), &TimeRuler::CacheInvalidatedRange);
+  connect(video_renderer_, &VideoRenderBackend::GeneratedFrame, this, &ViewerWidget::RendererGeneratedFrame);
   audio_renderer_ = new AudioBackend(this);
 
   waveform_view_->SetBackend(audio_renderer_);
@@ -522,6 +523,13 @@ void ViewerWidget::ContextMenuScopeTriggered(QAction *action)
   emit RequestScopePanel(static_cast<ScopePanel::Type>(action->data().toInt()));
 }
 
+void ViewerWidget::RendererGeneratedFrame(FramePtr f)
+{
+  foreach (ViewerDisplayWidget* glw, gl_widgets_) {
+    glw->SetImageFromLoadBuffer(f.get());
+  }
+}
+
 void ViewerWidget::UpdateRendererParameters()
 {
   if (!GetConnectedNode()) {
@@ -878,7 +886,7 @@ void ViewerWidget::SetZoomFromMenu(QAction *action)
 
 void ViewerWidget::InvalidateVisible(NodeInput* source)
 {
-  video_renderer_->InvalidateCache(TimeRange(GetTime(), GetTime()), source);
+  video_renderer_->InvalidateVisible(TimeRange(GetTime(), GetTime()), source);
 }
 
 OLIVE_NAMESPACE_EXIT
diff --git a/app/widget/viewer/viewer.h b/app/widget/viewer/viewer.h
index 6d22e89a8..afeeaadd0 100644
--- a/app/widget/viewer/viewer.h
+++ b/app/widget/viewer/viewer.h
@@ -236,6 +236,8 @@ private slots:
 
   void ContextMenuScopeTriggered(QAction* action);
 
+  void RendererGeneratedFrame(FramePtr f);
+
 };
 
 OLIVE_NAMESPACE_EXIT