diff --git a/src/libslic3r/Model.hpp b/src/libslic3r/Model.hpp
index 477b64b73..d707c8583 100644
--- a/src/libslic3r/Model.hpp
+++ b/src/libslic3r/Model.hpp
@@ -315,6 +315,9 @@ public:
     // Extruder ID is only valid for FFF. Returns -1 for SLA or if the extruder ID is not applicable (support volumes).
     int                 extruder_id() const;
 
+    void                set_splittable(const int val) { m_is_splittable = val; }
+    int                 is_splittable() const { return m_is_splittable; }
+
     // Split this volume, append the result to the object owning this volume.
     // Return the number of volumes created from this one.
     // This is useful to assign different materials to different volumes of an object.
@@ -387,6 +390,12 @@ private:
     TriangleMesh             m_convex_hull;
     Geometry::Transformation m_transformation;
 
+    // flag to optimize the checking if the volume is splittable
+    //     -1   ->   is unknown value (before first cheking)
+    //      0   ->   is not splittable
+    //      1   ->   is splittable
+    int                     m_is_splittable {-1};
+
     ModelVolume(ModelObject *object, const TriangleMesh &mesh) : mesh(mesh), m_type(MODEL_PART), object(object)
     {
         if (mesh.stl.stats.number_of_facets > 1)
diff --git a/src/slic3r/GUI/GUI_ObjectList.cpp b/src/slic3r/GUI/GUI_ObjectList.cpp
index 24aa5e45c..3426fd02a 100644
--- a/src/slic3r/GUI/GUI_ObjectList.cpp
+++ b/src/slic3r/GUI/GUI_ObjectList.cpp
@@ -1105,10 +1105,14 @@ bool ObjectList::is_splittable()
     if (!get_volume_by_item(item, volume) || !volume)
         return false;
 
+    if (volume->is_splittable() != -1) // if is_splittable value is already known
+        return volume->is_splittable() == 0 ? false : true;
+
     TriangleMeshPtrs meshptrs = volume->mesh.split();
     bool splittable = meshptrs.size() > 1;
     for (TriangleMesh* m : meshptrs) { delete m; }
 
+    volume->set_splittable(splittable ? 1 : 0);
     return splittable;
 }