diff --git a/src/app/main.cpp b/src/app/main.cpp
index 1260151..b58d03b 100644
--- a/src/app/main.cpp
+++ b/src/app/main.cpp
@@ -406,6 +406,10 @@ void buildWorkbench(QMainWindow& window, geopro::data::LocalSampleRepository& re
                 }
                 vtkRenderWindowInteractor* interactor = renderWindowPtr->GetInteractor();
                 if (*showSlice && interactor) {
+                    // 交互时目标帧率↑→体绘制自动降采样(AutoAdjustSampleDistances)，拖切片不卡;
+                    // 松手后按 StillUpdateRate 恢复全质量。
+                    interactor->SetDesiredUpdateRate(20.0);
+                    interactor->SetStillUpdateRate(0.001);
                     const std::vector<double> stops = vcs.stopValues();
                     const double vmn = stops.size() >= 2 ? stops.front() : 0.0;
                     const double vmx = stops.size() >= 2 ? stops.back() : 1.0;
diff --git a/src/render/actors/VoxelActor.cpp b/src/render/actors/VoxelActor.cpp
index 0037171..973e97a 100644
--- a/src/render/actors/VoxelActor.cpp
+++ b/src/render/actors/VoxelActor.cpp
@@ -74,6 +74,9 @@ vtkSmartPointer<vtkVolume> buildVoxel(const geopro::core::ScalarVolume& vol,
     // SmartVolumeMapper：有 GPU 走 GPU ray cast，否则自动回退 CPU，避免无 GPU 时卡死/失败。
     vtkNew<vtkSmartVolumeMapper> mapper;
     mapper->SetInputData(img);
+    // 交互时按 DesiredUpdateRate 自动降采样(与切片共渲时拖动更流畅)；静止恢复全质量。
+    mapper->SetAutoAdjustSampleDistances(1);
+    mapper->SetInteractiveAdjustSampleDistances(1);
 
     vtkNew<vtkVolumeProperty> prop;
     prop->SetColor(color);