diff --git a/COFTester/ViewModels/MainViewModel.cs b/COFTester/ViewModels/MainViewModel.cs
index 449a8c5..11647bb 100644
--- a/COFTester/ViewModels/MainViewModel.cs
+++ b/COFTester/ViewModels/MainViewModel.cs
@@ -51,6 +51,8 @@ public sealed class MainViewModel : ObservableObject, IDisposable
     private const ushort RegisterHorizontalDisplacement = 360;
     private const ushort RegisterLiftSpeed = 310;
     private const ushort RegisterLiftDisplacement = 320;
+    private static readonly TimeSpan RealtimeChartRefreshInterval = TimeSpan.FromMilliseconds(250);
+    private const double RealtimeChartDisplacementStepMm = 0.5;
 
     private readonly DispatcherTimer _timer;
     private readonly DispatcherTimer _deviceReconnectTimer;
@@ -125,6 +127,11 @@ public sealed class MainViewModel : ObservableObject, IDisposable
     private ushort? _pendingTableMotionStopCoil;
     private MachineRuntimeState _machineRuntimeState = MachineRuntimeState.Idle;
     private string _plcCommandSummary = "等待 PLC 控制指令。";
+    private double _runningPeakForceN;
+    private double _kineticForceSum;
+    private int _kineticSampleCount;
+    private double _lastRealtimeChartDisplacementMm = double.NaN;
+    private DateTime _lastRealtimeChartRefreshAt = DateTime.MinValue;
 
     public MainViewModel()
     {
@@ -758,6 +765,7 @@ public sealed class MainViewModel : ObservableObject, IDisposable
             _peakLineSamples.Clear();
             _averageLineSamples.Clear();
             _currentPointSample.Clear();
+            ResetRealtimeSamplingMetrics();
             CurrentForceN = 0;
             CurrentDisplacementMm = 0;
             CurrentPeakForceN = 0;
@@ -930,7 +938,6 @@ public sealed class MainViewModel : ObservableObject, IDisposable
                 return;
             }
 
-            _forceSamples.Add(new ObservablePoint(frame.DisplacementMm, CurrentForceN));
             _currentRunSamples.Add(new RawSampleRecord
             {
                 RunId = _activeRunId,
@@ -940,8 +947,9 @@ public sealed class MainViewModel : ObservableObject, IDisposable
                 ForceN = CurrentForceN,
                 SpeedMmPerMin = frame.SpeedMmPerMin
             });
+            AddRealtimeChartSample(frame.DisplacementMm, CurrentForceN);
             UpdateCurrentPoint(frame.DisplacementMm, CurrentForceN);
-            UpdatePreviewResult();
+            UpdatePreviewResult(frame.DisplacementMm, CurrentForceN);
             StaticCoefficient1 = frame.StaticCoefficient1;
             KineticCoefficient1 = frame.KineticCoefficient1;
             StandardDeviation1 = frame.StandardDeviation1;
@@ -952,19 +960,16 @@ public sealed class MainViewModel : ObservableObject, IDisposable
             CurrentStaticCoefficient = ResolveRepresentativeValue(activeReplicateCount, StaticCoefficient1, StaticCoefficient2);
             CurrentKineticCoefficient = ResolveRepresentativeValue(activeReplicateCount, KineticCoefficient1, KineticCoefficient2);
             TrialProgressPercent = Math.Min(100, frame.DisplacementMm / Math.Max(Recipe.TravelMm, 1) * 100);
-            UpdateReferenceLines();
-
-            ForceXAxes[0].MaxLimit = Math.Max(Recipe.TravelMm, frame.DisplacementMm + 5);
-            ForceYAxes[0].MaxLimit = Math.Max(CurrentPeakForceN * 1.15, 0.5);
-            _kineticBand.Yj = Math.Max(CurrentPeakForceN * 1.15, 0.5);
-            OnPropertyChanged(nameof(ForceXAxes));
-            OnPropertyChanged(nameof(ForceYAxes));
-            OnPropertyChanged(nameof(ForceSections));
 
             if (frame.IsCompleted)
             {
+                RefreshRealtimeChartPresentation(force: true);
                 FinalizeRun();
             }
+            else
+            {
+                RefreshRealtimeChartPresentation(force: false);
+            }
 
             RaiseStatusProperties();
         }
@@ -1038,15 +1043,43 @@ public sealed class MainViewModel : ObservableObject, IDisposable
         RaiseStatusProperties();
     }
 
-    private void UpdatePreviewResult()
+    private void AddRealtimeChartSample(double displacementMm, double forceN)
     {
-        CurrentPeakForceN = _forceSamples.Count == 0 ? 0 : _forceSamples.Max(sample => sample.Coordinate.SecondaryValue);
-
-        if (_forceSamples.Count > 5)
+        var sample = new ObservablePoint(displacementMm, forceN);
+        if (_forceSamples.Count == 0 || !IsFinite(_lastRealtimeChartDisplacementMm))
         {
-            var kineticWindow = _forceSamples.Skip((int)(_forceSamples.Count * 0.35)).ToArray();
-            CurrentAverageForceN = kineticWindow.Average(sample => sample.Coordinate.SecondaryValue);
+            _forceSamples.Add(sample);
+            _lastRealtimeChartDisplacementMm = displacementMm;
+            return;
         }
+
+        if (Math.Abs(displacementMm - _lastRealtimeChartDisplacementMm) >= RealtimeChartDisplacementStepMm)
+        {
+            _forceSamples.Add(sample);
+            _lastRealtimeChartDisplacementMm = displacementMm;
+            return;
+        }
+
+        _forceSamples[^1] = sample;
+    }
+
+    private void UpdatePreviewResult(double displacementMm, double forceN)
+    {
+        _runningPeakForceN = Math.Max(_runningPeakForceN, forceN);
+        CurrentPeakForceN = _runningPeakForceN;
+
+        var kineticStartMm = GetActiveTravelMm() * 0.35;
+        if (displacementMm >= kineticStartMm)
+        {
+            _kineticForceSum += forceN;
+            _kineticSampleCount++;
+            CurrentAverageForceN = _kineticForceSum / _kineticSampleCount;
+        }
+    }
+
+    private double GetActiveTravelMm()
+    {
+        return _activeRecipeSnapshot?.TravelMm ?? Recipe.TravelMm;
     }
 
     private int GetActiveReplicateCount()
@@ -1072,6 +1105,25 @@ public sealed class MainViewModel : ObservableObject, IDisposable
         UpdateReferenceLine(_averageLineSamples, CurrentAverageForceN);
     }
 
+    private void RefreshRealtimeChartPresentation(bool force)
+    {
+        var now = DateTime.UtcNow;
+        if (!force && now - _lastRealtimeChartRefreshAt < RealtimeChartRefreshInterval)
+        {
+            return;
+        }
+
+        _lastRealtimeChartRefreshAt = now;
+        UpdateReferenceLines();
+
+        ForceXAxes[0].MaxLimit = Math.Max(GetActiveTravelMm(), CurrentDisplacementMm + 5);
+        ForceYAxes[0].MaxLimit = Math.Max(CurrentPeakForceN * 1.15, 0.5);
+        _kineticBand.Yj = Math.Max(CurrentPeakForceN * 1.15, 0.5);
+        OnPropertyChanged(nameof(ForceXAxes));
+        OnPropertyChanged(nameof(ForceYAxes));
+        OnPropertyChanged(nameof(ForceSections));
+    }
+
     private void UpdateReferenceLine(ObservableCollection<ObservablePoint> target, double y)
     {
         if (y <= 0)
@@ -1080,12 +1132,28 @@ public sealed class MainViewModel : ObservableObject, IDisposable
             return;
         }
 
-        var xEnd = Math.Max(Recipe.TravelMm, CurrentDisplacementMm);
+        var xEnd = Math.Max(GetDisplayRecipeSnapshot().TravelMm, CurrentDisplacementMm);
+        if (target.Count == 2)
+        {
+            target[0] = new ObservablePoint(0, y);
+            target[1] = new ObservablePoint(xEnd, y);
+            return;
+        }
+
         target.Clear();
         target.Add(new ObservablePoint(0, y));
         target.Add(new ObservablePoint(xEnd, y));
     }
 
+    private void ResetRealtimeSamplingMetrics()
+    {
+        _runningPeakForceN = 0;
+        _kineticForceSum = 0;
+        _kineticSampleCount = 0;
+        _lastRealtimeChartDisplacementMm = double.NaN;
+        _lastRealtimeChartRefreshAt = DateTime.MinValue;
+    }
+
     private TestRecipeSnapshot GetDisplayRecipeSnapshot()
     {
         return _isShowingHistoricalRun && _displayedRecipeSnapshot is not null
@@ -1435,6 +1503,7 @@ public sealed class MainViewModel : ObservableObject, IDisposable
         _peakLineSamples.Clear();
         _averageLineSamples.Clear();
         _currentPointSample.Clear();
+        ResetRealtimeSamplingMetrics();
 
         CurrentForceN = 0;
         CurrentDisplacementMm = 0;