diff --git a/3rdparty/qv2ray/v2/ui/widgets/speedchart/SpeedWidget.cpp b/3rdparty/qv2ray/v2/ui/widgets/speedchart/SpeedWidget.cpp
index 21a4eca..bf6fa07 100644
--- a/3rdparty/qv2ray/v2/ui/widgets/speedchart/SpeedWidget.cpp
+++ b/3rdparty/qv2ray/v2/ui/widgets/speedchart/SpeedWidget.cpp
@@ -70,7 +70,7 @@ SpeedWidget::SpeedWidget(QWidget *parent) : QGraphicsView(parent)
     UpdateSpeedPlotSettings();
 }
 
-void SpeedWidget::AddPointData(QMap<SpeedWidget::GraphType, long> data)
+void SpeedWidget::AddPointData(const QMap<SpeedWidget::GraphType, long>& data)
 {
     SpeedWidget::PointData point;
     point.x = QDateTime::currentMSecsSinceEpoch() / 1000;
@@ -302,7 +302,7 @@ void SpeedWidget::paintEvent(QPaintEvent *)
     double legendHeight = 0;
     int legendWidth = 0;
 
-    for (const auto &property : qAsConst(m_properties))
+    for (const auto &property : std::as_const(m_properties))
     {
         if (fontMetrics.horizontalAdvance(property.name) > legendWidth)
             legendWidth = fontMetrics.horizontalAdvance(property.name);
@@ -318,7 +318,7 @@ void SpeedWidget::paintEvent(QPaintEvent *)
         painter.fillRect(legendBackgroundRect, legendBackgroundColor);
 
         int i = 0;
-        for (const auto &property : qAsConst(m_properties))
+        for (const auto &property : std::as_const(m_properties))
         {
             int nameSize = fontMetrics.horizontalAdvance(property.name);
             double indent = 1.5 * (i++) * fontMetrics.height();
diff --git a/3rdparty/qv2ray/v2/ui/widgets/speedchart/SpeedWidget.hpp b/3rdparty/qv2ray/v2/ui/widgets/speedchart/SpeedWidget.hpp
index 3eeae4e..9825595 100644
--- a/3rdparty/qv2ray/v2/ui/widgets/speedchart/SpeedWidget.hpp
+++ b/3rdparty/qv2ray/v2/ui/widgets/speedchart/SpeedWidget.hpp
@@ -30,6 +30,7 @@
 #include <QGraphicsView>
 #include <QMap>
 #include <QPen>
+#include <utility>
 
 class SpeedWidget : public QGraphicsView
 {
@@ -53,14 +54,14 @@ class SpeedWidget : public QGraphicsView
         quint64 y[NB_GRAPHS];
         PointData()
         {
-            for (auto i = 0; i < NB_GRAPHS; i++)
-                y[i] = 0;
+            for (unsigned long long & i : y)
+                i = 0;
         }
     };
 
     explicit SpeedWidget(QWidget *parent = nullptr);
     void UpdateSpeedPlotSettings();
-    void AddPointData(QMap<SpeedWidget::GraphType, long> data);
+    void AddPointData(const QMap<SpeedWidget::GraphType, long>& data);
     void Clear();
     void replot();
 
@@ -70,8 +71,8 @@ class SpeedWidget : public QGraphicsView
   private:
     struct GraphProperties
     {
-        GraphProperties(){};
-        GraphProperties(const QString &name, const QPen &pen) : name(name), pen(pen){};
+        GraphProperties()= default;
+        GraphProperties(QString name, QPen pen) : name(std::move(name)), pen(std::move(pen)){};
         QString name;
         QPen pen;
     };