diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index e25cf41511..a19bed05a8 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -4739,11 +4739,19 @@ void GLCanvas3D::on_mouse(wxMouseEvent& evt)
 
 void GLCanvas3D::on_paint(wxPaintEvent& evt)
 {
-    if (m_initialized)
+    if (m_initialized) {
+#ifdef __WXMSW__
+        // Idle events are not dispatched during the Windows resize modal loop,
+        // so render immediately to avoid blank frames.
+        _refresh_if_shown_on_screen();
+        m_dirty = false;
+#else
         m_dirty = true;
-    else
+#endif
+    } else {
         // Call render directly, so it gets initialized immediately, not from On Idle handler.
         this->render();
+    }
 }
 
 void GLCanvas3D::force_set_focus() {
diff --git a/src/slic3r/GUI/OpenGLManager.cpp b/src/slic3r/GUI/OpenGLManager.cpp
index a585bdac96..e820639899 100644
--- a/src/slic3r/GUI/OpenGLManager.cpp
+++ b/src/slic3r/GUI/OpenGLManager.cpp
@@ -428,7 +428,10 @@ wxGLCanvas* OpenGLManager::create_wxglcanvas(wxWindow& parent)
     if (! can_multisample())
         attribList[12] = 0;
 
-    return new wxGLCanvas(&parent, wxID_ANY, attribList, wxDefaultPosition, wxDefaultSize, wxWANTS_CHARS);
+    wxGLCanvas* canvas = new wxGLCanvas(&parent, wxID_ANY, attribList, wxDefaultPosition, wxDefaultSize, wxWANTS_CHARS);
+    // The GL canvas paints its entire surface, so background erasing is unnecessary.
+    canvas->SetBackgroundStyle(wxBG_STYLE_PAINT);
+    return canvas;
 }
 
 void OpenGLManager::detect_multisample(int* attribList)