diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1841f067a2..d39e8cf236 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -25,7 +25,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
-- `plot`: speed optimization: `tic();plot(rand(300,300), rand(300,300));toc()`
+- `plot`, `plot3` : speed optimization: `tic();plot(rand(300,300), rand(300,300));toc()`
 - fmtlib 11.1.3
 
 ## 1.12.0 (2025-02-16)
diff --git a/modules/graphics/examples/cube/demo_cube.m b/modules/graphics/examples/cube/demo_cube.m
new file mode 100644
index 0000000000..f5eb86014e
--- /dev/null
+++ b/modules/graphics/examples/cube/demo_cube.m
@@ -0,0 +1,62 @@
+%=============================================================================
+% Copyright (c) 2016-present Allan CORNET (Nelson)
+%=============================================================================
+% This file is part of the Nelson.
+%=============================================================================
+% LICENCE_BLOCK_BEGIN
+% SPDX-License-Identifier: LGPL-3.0-or-later
+% LICENCE_BLOCK_END
+%=============================================================================
+% Define cube vertices
+vertices = [
+    -1 -1 -1;
+    -1 -1  1;
+    -1  1 -1;
+    -1  1  1;
+     1 -1 -1;
+     1 -1  1;
+     1  1 -1;
+     1  1  1
+];
+
+% Define cube edges
+edges = [
+    1 2; 1 3; 1 5;
+    2 4; 2 6;
+    3 4; 3 7;
+    4 8;
+    5 6; 5 7;
+    6 8;
+    7 8
+];
+
+% Generate random lines inside the cube
+numLines = 1000; % Increased number of lines
+randLines = -1 + 2 * rand(numLines, 6); % Random points in range [-1,1]
+colors = rand(numLines, 3); % Generate random colors
+
+% Create figure
+f = figure('Visible', 'off');
+axis equal;
+axis off
+grid on;
+view(3);
+hold on;
+
+% Plot cube edges
+for i = 1:size(edges, 1)
+    plot3(vertices(edges(i, :), 1), vertices(edges(i, :), 2), vertices(edges(i, :), 3), 'k', 'LineWidth', 1);
+end
+
+% Plot random lines inside the cube with multiple colors
+plot3([randLines(:,1), randLines(:,4)]', ...
+      [randLines(:,2), randLines(:,5)]', ...
+      [randLines(:,3), randLines(:,6)]', 'LineWidth', 0.5);
+f.Visible = 'on';
+
+% Rotate the cube
+for angle = 1:3600
+  if (isgraphics(f))
+    view(angle, 30);
+  end
+end
diff --git a/modules/graphics/functions/plot.m b/modules/graphics/functions/plot.m
index 88b301fd7c..12c7503297 100644
--- a/modules/graphics/functions/plot.m
+++ b/modules/graphics/functions/plot.m
@@ -90,7 +90,9 @@
     end
   end
   axes(saveca);
-  h.Visible='on';
+  if isempty(find(strcmp(propertiesList, 'Visible')))
+    h.Visible = 'on';
+  end
   if (nargout > 0)
     varargout{1} = h;
   end
diff --git a/modules/graphics/functions/plot3.m b/modules/graphics/functions/plot3.m
index 8e63002510..0f99aaeeff 100644
--- a/modules/graphics/functions/plot3.m
+++ b/modules/graphics/functions/plot3.m
@@ -71,6 +71,9 @@
     view(3);
   end
   axes(backupCurrentAxis);
+  if isempty(find(strcmp(propertiesList, 'Visible')))
+    h.Visible = 'on';
+  end
   if (nargout > 0)
     varargout{1} = h;
   end
@@ -131,6 +134,6 @@
   if (~any(strcmp(lineProperties, 'LineStyle')))
     lineProperties = [lineProperties, {'LineStyle', lineStyle}];
   end  
-  hl = __line__('Parent', go, 'XData', x, 'YData', y, 'ZData', z, 'Color', color, lineProperties{:});
+  hl = __line__('Parent', go, 'XData', x, 'YData', y, 'ZData', z, 'Color', color, 'Visible', 'off', lineProperties{:});
 end
 %=============================================================================
diff --git a/modules/graphics/tests/test_examples.m b/modules/graphics/tests/test_examples.m
index 13a5ea54d3..771f3b9a1b 100644
--- a/modules/graphics/tests/test_examples.m
+++ b/modules/graphics/tests/test_examples.m
@@ -14,4 +14,5 @@
 run([examples_directory, 'nefertiti-mask/nefertiti_mask.m']);
 run([examples_directory, 'stanford-bunny/stanford_bunny.m']);
 run([examples_directory, 'movie/demo_movie.m']);
+run([examples_directory, 'cube/demo_cube.m']);
 %=============================================================================
\ No newline at end of file
diff --git a/modules/gui/src/cpp/MainGuiObject.cpp b/modules/gui/src/cpp/MainGuiObject.cpp
index 454ee29711..01ebb6bc86 100644
--- a/modules/gui/src/cpp/MainGuiObject.cpp
+++ b/modules/gui/src/cpp/MainGuiObject.cpp
@@ -135,7 +135,7 @@ DestroyMainGuiObject(void* term)
             delete nlsTerm;
             nlsTerm = nullptr;
         }
-        NelSonQtApp->deleteLater();
+        delete NelSonQtApp;
         NelSonQtApp = nullptr;
     }
     DestroyConsole();