diff --git a/tools/cabana/SConscript b/tools/cabana/SConscript
index d9156f229a..7d5129fc16 100644
--- a/tools/cabana/SConscript
+++ b/tools/cabana/SConscript
@@ -28,7 +28,7 @@ cabana_env.Depends(assets, Glob('/assets/*', exclude=[assets, assets_src, "asset
 
 prev_moc_path = cabana_env['QT_MOCHPREFIX']
 cabana_env['QT_MOCHPREFIX'] = os.path.dirname(prev_moc_path) + '/cabana/moc_'
-cabana_lib = cabana_env.Library("cabana_lib", ['mainwin.cc', 'streams/livestream.cc', 'streams/abstractstream.cc', 'streams/replaystream.cc', 'binaryview.cc', 'chartswidget.cc', 'historylog.cc', 'videowidget.cc', 'signaledit.cc', 
+cabana_lib = cabana_env.Library("cabana_lib", ['mainwin.cc', 'streams/livestream.cc', 'streams/abstractstream.cc', 'streams/replaystream.cc', 'binaryview.cc', 'chartswidget.cc', 'historylog.cc', 'videowidget.cc', 'signalview.cc', 
                                                'dbc/dbc.cc', 'dbc/dbcfile.cc', 'dbc/dbcmanager.cc',
                                                'commands.cc', 'messageswidget.cc', 'route.cc', 'settings.cc', 'util.cc', 'detailwidget.cc', 'tools/findsimilarbits.cc'], LIBS=cabana_libs, FRAMEWORKS=base_frameworks)
 cabana_env.Program('_cabana', ['cabana.cc', cabana_lib, assets], LIBS=cabana_libs, FRAMEWORKS=base_frameworks)
diff --git a/tools/cabana/binaryview.cc b/tools/cabana/binaryview.cc
index 0a4f6fc999..84225bb96c 100644
--- a/tools/cabana/binaryview.cc
+++ b/tools/cabana/binaryview.cc
@@ -11,7 +11,7 @@
 #include <QToolTip>
 
 #include "tools/cabana/commands.h"
-#include "tools/cabana/signaledit.h"
+#include "tools/cabana/signalview.h"
 
 // BinaryView
 
diff --git a/tools/cabana/chartswidget.cc b/tools/cabana/chartswidget.cc
index ef8524be37..24415c6f95 100644
--- a/tools/cabana/chartswidget.cc
+++ b/tools/cabana/chartswidget.cc
@@ -189,7 +189,7 @@ void ChartsWidget::setMaxChartRange(int value) {
 void ChartsWidget::updateToolBar() {
   title_label->setText(tr("Charts: %1").arg(charts.size()));
   columns_action->setText(tr("Column: %1").arg(column_count));
-  range_lb->setText(QString("Range: %1:%2 ").arg(max_chart_range / 60, 2, 10, QLatin1Char('0')).arg(max_chart_range % 60, 2, 10, QLatin1Char('0')));
+  range_lb->setText(QString("Range: %1 ").arg(utils::formatSeconds(max_chart_range)));
   range_lb_action->setVisible(!is_zoomed);
   range_slider_action->setVisible(!is_zoomed);
   undo_zoom_action->setVisible(is_zoomed);
@@ -528,7 +528,7 @@ void ChartView::updatePlot(double cur, double min, double max) {
     updateAxisY();
     updateSeriesPoints();
   }
-  scene()->invalidate({}, QGraphicsScene::ForegroundLayer);
+  update();
 }
 
 void ChartView::updateSeriesPoints() {
@@ -536,14 +536,16 @@ void ChartView::updateSeriesPoints() {
   for (auto &s : sigs) {
     auto begin = std::lower_bound(s.vals.begin(), s.vals.end(), axis_x->min(), xLessThan);
     auto end = std::lower_bound(begin, s.vals.end(), axis_x->max(), xLessThan);
-
-    int num_points = std::max<int>(end - begin, 1);
-    int pixels_per_point = width() / num_points;
-
-    if (series_type == SeriesType::Scatter) {
-      ((QScatterSeries *)s.series)->setMarkerSize(std::clamp(pixels_per_point / 3, 2, 8) * devicePixelRatioF());
-    } else {
-      s.series->setPointsVisible(pixels_per_point > 20);
+    if (begin != end) {
+      int num_points = std::max<int>((end - begin), 1);
+      QPointF right_pt = end == s.vals.end() ? s.vals.back() : *end;
+      double pixels_per_point = (chart()->mapToPosition(right_pt).x() - chart()->mapToPosition(*begin).x()) / num_points;
+
+      if (series_type == SeriesType::Scatter) {
+        ((QScatterSeries *)s.series)->setMarkerSize(std::clamp(pixels_per_point / 2.0, 2.0, 8.0) * devicePixelRatioF());
+      } else {
+        s.series->setPointsVisible(pixels_per_point > 20);
+      }
     }
   }
 }
@@ -715,7 +717,7 @@ void ChartView::mouseReleaseEvent(QMouseEvent *event) {
       // zoom in if selected range is greater than 0.5s
       emit zoomIn(min_rounded, max_rounded);
     } else {
-      scene()->invalidate({}, QGraphicsScene::ForegroundLayer);
+      update();
     }
     event->accept();
   } else if (!can->liveStreaming() && event->button() == Qt::RightButton) {
@@ -773,7 +775,7 @@ void ChartView::mouseMoveEvent(QMouseEvent *ev) {
     text_list.push_front(QString::number(chart()->mapToValue({x, 0}).x(), 'f', 3));
     QPointF tooltip_pt(x + 12, plot_area.top() - 20);
     QToolTip::showText(mapToGlobal(tooltip_pt.toPoint()), text_list.join("<br />"), this, plot_area.toRect());
-    scene()->invalidate({}, QGraphicsScene::ForegroundLayer);
+    update();
   } else {
     QToolTip::hideText();
   }
@@ -786,7 +788,7 @@ void ChartView::mouseMoveEvent(QMouseEvent *ev) {
     if (rubber_rect != rubber->geometry()) {
       rubber->setGeometry(rubber_rect);
     }
-    scene()->invalidate({}, QGraphicsScene::ForegroundLayer);
+    update();
   }
 }
 
@@ -847,8 +849,8 @@ void ChartView::drawForeground(QPainter *painter, const QRectF &rect) {
     if (s.series->useOpenGL() && s.series->isVisible() && s.series->pointsVisible()) {
       auto first = std::lower_bound(s.vals.begin(), s.vals.end(), axis_x->min(), xLessThan);
       auto last = std::lower_bound(first, s.vals.end(), axis_x->max(), xLessThan);
+      painter->setBrush(s.series->color());
       for (auto it = first; it != last; ++it) {
-        painter->setBrush(s.series->color());
         painter->drawEllipse(chart()->mapToPosition(*it), 4, 4);
       }
     }
diff --git a/tools/cabana/detailwidget.h b/tools/cabana/detailwidget.h
index cc5bffd534..2794d41b99 100644
--- a/tools/cabana/detailwidget.h
+++ b/tools/cabana/detailwidget.h
@@ -8,7 +8,7 @@
 #include "tools/cabana/binaryview.h"
 #include "tools/cabana/chartswidget.h"
 #include "tools/cabana/historylog.h"
-#include "tools/cabana/signaledit.h"
+#include "tools/cabana/signalview.h"
 
 class EditMessageDialog : public QDialog {
 public:
diff --git a/tools/cabana/settings.cc b/tools/cabana/settings.cc
index 00bbb94de5..9e829708b1 100644
--- a/tools/cabana/settings.cc
+++ b/tools/cabana/settings.cc
@@ -27,6 +27,7 @@ void Settings::save() {
   s.setValue("recent_files", recent_files);
   s.setValue("message_header_state", message_header_state);
   s.setValue("chart_series_type", chart_series_type);
+  s.setValue("sparkline_range", sparkline_range);
 }
 
 void Settings::load() {
@@ -44,6 +45,7 @@ void Settings::load() {
   recent_files = s.value("recent_files").toStringList();
   message_header_state = s.value("message_header_state").toByteArray();
   chart_series_type = s.value("chart_series_type", 0).toInt();
+  sparkline_range = s.value("sparkline_range", 15).toInt();
 }
 
 // SettingsDlg
diff --git a/tools/cabana/settings.h b/tools/cabana/settings.h
index c3ba906576..a8b6d189a5 100644
--- a/tools/cabana/settings.h
+++ b/tools/cabana/settings.h
@@ -17,8 +17,9 @@ public:
   int max_cached_minutes = 30;
   int chart_height = 200;
   int chart_column_count = 1;
-  int chart_range = 3 * 60; // e minutes
+  int chart_range = 3 * 60; // 3 minutes
   int chart_series_type = 0;
+  int sparkline_range = 15; // 15 seconds
   QString last_dir;
   QString last_route_dir;
   QByteArray geometry;
diff --git a/tools/cabana/signaledit.cc b/tools/cabana/signalview.cc
similarity index 94%
rename from tools/cabana/signaledit.cc
rename to tools/cabana/signalview.cc
index a2455a0317..3f8a38825a 100644
--- a/tools/cabana/signaledit.cc
+++ b/tools/cabana/signalview.cc
@@ -1,4 +1,4 @@
-#include "tools/cabana/signaledit.h"
+#include "tools/cabana/signalview.h"
 
 #include <QApplication>
 #include <QCompleter>
@@ -366,17 +366,15 @@ void SignalItemDelegate::paint(QPainter *painter, const QStyleOptionViewItem &op
 
 void SignalItemDelegate::drawSparkline(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const {
   static std::vector<QPointF> points;
-  // TODO: get seconds from settings.
-  const uint64_t chart_seconds = 15;  // seconds
   const auto &msg_id = ((SignalView *)parent())->msg_id;
   const auto &msgs = can->events().at(msg_id);
   uint64_t ts = (can->lastMessage(msg_id).ts + can->routeStartTime()) * 1e9;
-  auto first = std::lower_bound(msgs.cbegin(), msgs.cend(), CanEvent{.mono_time = (uint64_t)std::max<int64_t>(ts - chart_seconds * 1e9, 0)});
-  if (first != msgs.cend()) {
+  auto first = std::lower_bound(msgs.cbegin(), msgs.cend(), CanEvent{.mono_time = (uint64_t)std::max<int64_t>(ts - settings.sparkline_range * 1e9, 0)});
+  auto last = std::upper_bound(first, msgs.cend(), CanEvent{.mono_time = ts});
+  if (first != last) {
     double min = std::numeric_limits<double>::max();
     double max = std::numeric_limits<double>::lowest();
     const auto sig = ((SignalModel::Item *)index.internalPointer())->sig;
-    auto last = std::lower_bound(first, msgs.cend(), CanEvent{.mono_time = ts});
     points.clear();
     for (auto it = first; it != last; ++it) {
       double value = get_raw_value(it->dat, it->size, *sig);
@@ -391,7 +389,7 @@ void SignalItemDelegate::drawSparkline(QPainter *painter, const QStyleOptionView
 
     int h_margin = option.widget->style()->pixelMetric(QStyle::PM_FocusFrameHMargin);
     int v_margin = std::max(option.widget->style()->pixelMetric(QStyle::PM_FocusFrameVMargin) + 2, 4);
-    const double xscale = (option.rect.width() - 175.0 * option.widget->devicePixelRatioF() - h_margin * 2) / chart_seconds;
+    const double xscale = (option.rect.width() - 175.0 * option.widget->devicePixelRatioF() - h_margin * 2) / settings.sparkline_range;
     const double yscale = (option.rect.height() - v_margin * 2) / (max - min);
     const int left = option.rect.left();
     const int top = option.rect.top() + v_margin;
@@ -401,6 +399,13 @@ void SignalItemDelegate::drawSparkline(QPainter *painter, const QStyleOptionView
     }
     painter->setPen(getColor(sig));
     painter->drawPolyline(points.data(), points.size());
+    if ((points.back().x() - points.front().x()) / points.size() > 10) {
+      painter->setPen(Qt::NoPen);
+      painter->setBrush(getColor(sig));
+      for (const auto &pt : points) {
+        painter->drawEllipse(pt, 2, 2);
+      }
+    }
   }
 }
 
@@ -451,6 +456,17 @@ SignalView::SignalView(ChartsWidget *charts, QWidget *parent) : charts(charts),
   filter_edit->setPlaceholderText(tr("filter signals"));
   hl->addWidget(filter_edit);
   hl->addStretch(1);
+
+  // WARNING: increasing the maximum range can result in severe performance degradation.
+  // 30s is a reasonable value at present.
+  const int max_range = 30; // 30s
+  settings.sparkline_range = std::clamp(settings.sparkline_range, 1, max_range);
+  hl->addWidget(sparkline_label = new QLabel());
+  hl->addWidget(sparkline_range_slider = new QSlider(Qt::Horizontal, this));
+  sparkline_range_slider->setRange(1, max_range);
+  sparkline_range_slider->setValue(settings.sparkline_range);
+  sparkline_range_slider->setToolTip(tr("Sparkline time range"));
+
   auto collapse_btn = toolButton("dash-square", tr("Collapse All"));
   collapse_btn->setIconSize({12, 12});
   hl->addWidget(collapse_btn);
@@ -473,8 +489,10 @@ SignalView::SignalView(ChartsWidget *charts, QWidget *parent) : charts(charts),
   main_layout->setSpacing(0);
   main_layout->addWidget(title_bar);
   main_layout->addWidget(tree);
+  updateToolBar();
 
   QObject::connect(filter_edit, &QLineEdit::textEdited, model, &SignalModel::setFilter);
+  QObject::connect(sparkline_range_slider, &QSlider::valueChanged, this, &SignalView::setSparklineRange);
   QObject::connect(collapse_btn, &QPushButton::clicked, tree, &QTreeView::collapseAll);
   QObject::connect(tree, &QAbstractItemView::clicked, this, &SignalView::rowClicked);
   QObject::connect(tree, &QTreeView::viewportEntered, [this]() { emit highlight(nullptr); });
@@ -521,7 +539,7 @@ void SignalView::rowsChanged() {
       });
     }
   }
-  signal_count_lb->setText(tr("Signals: %1").arg(model->rowCount()));
+  updateToolBar();
   updateChartState();
 }
 
@@ -569,6 +587,17 @@ void SignalView::signalHovered(const cabana::Signal *sig) {
   }
 }
 
+void SignalView::updateToolBar() {
+  signal_count_lb->setText(tr("Signals: %1").arg(model->rowCount()));
+  sparkline_label->setText(QString("Range: %1 ").arg(utils::formatSeconds(settings.sparkline_range)));
+}
+
+void SignalView::setSparklineRange(int value) {
+  settings.sparkline_range = value;
+  updateToolBar();
+  model->updateState(nullptr);
+}
+
 void SignalView::leaveEvent(QEvent *event) {
   emit highlight(nullptr);
   QWidget::leaveEvent(event);
diff --git a/tools/cabana/signaledit.h b/tools/cabana/signalview.h
similarity index 96%
rename from tools/cabana/signaledit.h
rename to tools/cabana/signalview.h
index 163edcad69..50ba4e06b8 100644
--- a/tools/cabana/signaledit.h
+++ b/tools/cabana/signalview.h
@@ -3,6 +3,7 @@
 #include <QAbstractItemModel>
 #include <QLabel>
 #include <QLineEdit>
+#include <QSlider>
 #include <QStyledItemDelegate>
 #include <QTableWidget>
 #include <QTreeView>
@@ -109,6 +110,8 @@ signals:
 private:
   void rowsChanged();
   void leaveEvent(QEvent *event);
+  void updateToolBar();
+  void setSparklineRange(int value);
 
   struct TreeView : public QTreeView {
     TreeView(QWidget *parent) : QTreeView(parent) {}
@@ -120,6 +123,8 @@ private:
   };
 
   TreeView *tree;
+  QLabel *sparkline_label;
+  QSlider *sparkline_range_slider;
   QLineEdit *filter_edit;
   ChartsWidget *charts;
   QLabel *signal_count_lb;
diff --git a/tools/cabana/util.h b/tools/cabana/util.h
index 7f40c42352..e90a838af8 100644
--- a/tools/cabana/util.h
+++ b/tools/cabana/util.h
@@ -4,6 +4,7 @@
 #include <cmath>
 
 #include <QByteArray>
+#include <QDateTime>
 #include <QColor>
 #include <QFont>
 #include <QRegExpValidator>
@@ -97,6 +98,9 @@ public:
 
 namespace utils {
 QPixmap icon(const QString &id);
+inline QString formatSeconds(int seconds) {
+  return QDateTime::fromTime_t(seconds).toString(seconds > 60 * 60 ? "hh:mm:ss" : "mm:ss");
+}
 }
 
 QToolButton *toolButton(const QString &icon, const QString &tooltip);
diff --git a/tools/cabana/videowidget.cc b/tools/cabana/videowidget.cc
index 0e9714994e..fe9e00bc45 100644
--- a/tools/cabana/videowidget.cc
+++ b/tools/cabana/videowidget.cc
@@ -1,7 +1,6 @@
 #include "tools/cabana/videowidget.h"
 
 #include <QButtonGroup>
-#include <QDateTime>
 #include <QMouseEvent>
 #include <QPainter>
 #include <QStyleOptionSlider>
@@ -20,10 +19,6 @@ static const QColor timeline_colors[] = {
   [(int)TimelineType::AlertCritical] = QColor(199, 0, 57),
 };
 
-static inline QString formatTime(int seconds) {
-  return QDateTime::fromTime_t(seconds).toString(seconds > 60 * 60 ? "hh:mm:ss" : "mm:ss");
-}
-
 VideoWidget::VideoWidget(QWidget *parent) : QFrame(parent) {
   setFrameStyle(QFrame::StyledPanel | QFrame::Plain);
   auto main_layout = new QVBoxLayout(this);
@@ -101,11 +96,11 @@ QWidget *VideoWidget::createCameraWidget() {
   slider_layout->addWidget(end_time_label);
   l->addLayout(slider_layout);
   QObject::connect(slider, &QSlider::sliderReleased, [this]() { can->seekTo(slider->value() / 1000.0); });
-  QObject::connect(slider, &QSlider::valueChanged, [=](int value) { time_label->setText(formatTime(value / 1000)); });
+  QObject::connect(slider, &QSlider::valueChanged, [=](int value) { time_label->setText(utils::formatSeconds(value / 1000)); });
   QObject::connect(cam_widget, &CameraWidget::clicked, []() { can->pause(!can->isPaused()); });
   QObject::connect(can, &AbstractStream::updated, this, &VideoWidget::updateState);
   QObject::connect(can, &AbstractStream::streamStarted, [this]() {
-    end_time_label->setText(formatTime(can->totalSeconds()));
+    end_time_label->setText(utils::formatSeconds(can->totalSeconds()));
     slider->setRange(0, can->totalSeconds() * 1000);
   });
   return w;
@@ -116,7 +111,7 @@ void VideoWidget::rangeChanged(double min, double max, bool is_zoomed) {
     min = 0;
     max = can->totalSeconds();
   }
-  end_time_label->setText(formatTime(max));
+  end_time_label->setText(utils::formatSeconds(max));
   slider->setRange(min * 1000, max * 1000);
 }
 
@@ -230,7 +225,7 @@ void Slider::mouseMoveEvent(QMouseEvent *e) {
   }
   int x = std::clamp(e->pos().x() - thumb.width() / 2, THUMBNAIL_MARGIN, rect().right() - thumb.width() - THUMBNAIL_MARGIN);
   int y = -thumb.height() - THUMBNAIL_MARGIN - style()->pixelMetric(QStyle::PM_LayoutVerticalSpacing);
-  thumbnail_label.showPixmap(mapToGlobal({x, y}), formatTime(seconds), thumb);
+  thumbnail_label.showPixmap(mapToGlobal({x, y}), utils::formatSeconds(seconds), thumb);
   QSlider::mouseMoveEvent(e);
 }