diff --git a/Breaknes/Breaknes/FormMain.cs b/Breaknes/Breaknes/FormMain.cs
index cb40dd41..edc6a708 100644
--- a/Breaknes/Breaknes/FormMain.cs
+++ b/Breaknes/Breaknes/FormMain.cs
@@ -48,6 +48,7 @@ private void loadROMDumpToolStripMenuItem_Click(object sender, EventArgs e)
 			if (openFileDialog1.ShowDialog() == DialogResult.OK)
 			{
 				string filename = openFileDialog1.FileName;
+				board.Paused = true;
 				board.EjectCartridge();
 				if (board.InsertCartridge(filename) < 0)
 				{
@@ -78,12 +79,17 @@ private void settingsToolStripMenuItem_Click(object sender, EventArgs e)
 
 		private void Settings_FormClosed(object? sender, FormClosedEventArgs e)
 		{
-			board.Paused = true;
-			board.EjectCartridge();
-			board.DisposeBoard();
-			var settings = FormSettings.LoadSettings();
-			board.CreateBoard(BoardDescriptionLoader.Load(), settings.MainBoard);
-			Text = original_title;
+			FormSettings form_settings = (FormSettings)sender;
+
+			if (form_settings.PurgeBoard)
+			{
+				board.Paused = true;
+				board.EjectCartridge();
+				board.DisposeBoard();
+				var settings = FormSettings.LoadSettings();
+				board.CreateBoard(BoardDescriptionLoader.Load(), settings.MainBoard);
+				Text = original_title;
+			}
 		}
 
 		private void openDebuggerToolStripMenuItem_Click(object sender, EventArgs e)
diff --git a/Breaknes/Breaknes/FormSettings.cs b/Breaknes/Breaknes/FormSettings.cs
index 969807f6..8c3bab2d 100644
--- a/Breaknes/Breaknes/FormSettings.cs
+++ b/Breaknes/Breaknes/FormSettings.cs
@@ -5,6 +5,9 @@ namespace Breaknes
 {
 	public partial class FormSettings : Form
 	{
+		public bool PurgeBoard = false;
+		private string prev_board;
+
 		public FormSettings()
 		{
 			InitializeComponent();
@@ -59,13 +62,17 @@ static BreaknesSettings SetDefaultSettings()
 
 		private void FormSettings_Load(object sender, EventArgs e)
 		{
-			propertyGrid1.SelectedObject = LoadSettings();
+			var settings = LoadSettings();
+			prev_board = settings.MainBoard;
+			propertyGrid1.SelectedObject = settings;
 		}
 
 		private void button1_Click(object sender, EventArgs e)
 		{
-			SaveSettings((BreaknesSettings)propertyGrid1.SelectedObject);
+			BreaknesSettings settings = (BreaknesSettings)propertyGrid1.SelectedObject;
+			SaveSettings(settings);
 			Close();
+			PurgeBoard = settings.MainBoard != prev_board;
 		}
 
 		private void FormSettings_KeyDown(object sender, KeyEventArgs e)
diff --git a/Breaknes/Breaknes/VideoProcessing.cs b/Breaknes/Breaknes/VideoProcessing.cs
index e362000b..66467317 100644
--- a/Breaknes/Breaknes/VideoProcessing.cs
+++ b/Breaknes/Breaknes/VideoProcessing.cs
@@ -22,6 +22,8 @@ public class VideoRender
 		private OnRenderField? onRenderField = null;
 		public delegate void OnRenderField();
 
+		private long field_counter = 0;
+
 		public VideoRender(OnRenderField _onRender)
 		{
 			onRenderField = _onRender;
@@ -146,6 +148,8 @@ void VisualizeField()
 			}
 			gr.Dispose();
 
+			field_counter++;
+
 			onRenderField?.Invoke();
 		}
 	}
diff --git a/BreaksAPU/APUSim/Readme.md b/BreaksAPU/APUSim/Readme.md
index d3355dff..d01cd667 100644
--- a/BreaksAPU/APUSim/Readme.md
+++ b/BreaksAPU/APUSim/Readme.md
@@ -2,6 +2,8 @@
 
 APU simulator at the gate level.
 
+Note: In the Breaks project, the term APU refers to the entire CPU chip (2A03/2A07), which includes the 6502 core and the APU itself. Therefore, here APU and CPU are synonymous.
+
 ## Simulation Approaches
 
 In general, all approaches are tried on the M6502Core, in terms of APU nothing particularly new. We take the circuit and repeat its work in C++. In the beginning somehow, and then we try to optimize it.
diff --git a/UnitTest/Readme.md b/UnitTest/Readme.md
index b86fd43e..b307ab1f 100644
--- a/UnitTest/Readme.md
+++ b/UnitTest/Readme.md
@@ -9,3 +9,20 @@ Each emulated chip class contains a friendly class that has access to all intern
 - M6502Core: M6502CoreUnitTest::UnitTest
 - APUSim: APUSimUnitTest::UnitTest
 - PPUSim: PPUSimUnitTest::UnitTest
+
+## MegaCycles
+
+Right now there are three tests that are not running successfully. They are used to measure the performance of the 6502 Core, APU and PPU.
+
+Current performance:
+
+```
+Core executed 1789772 cycles in real 2282 msec
+You're 2.28 times slower :(
+
+APU+Core executed 21477272 cycles in real 18297 msec
+You're 18.30 times slower :(
+
+PPU executed 21477272 cycles in real 21828 msec
+You're 21.83 times slower :(
+```
diff --git a/UnitTest/UnitTest.cpp b/UnitTest/UnitTest.cpp
index e3b55712..2910da58 100644
--- a/UnitTest/UnitTest.cpp
+++ b/UnitTest/UnitTest.cpp
@@ -83,9 +83,9 @@ namespace UnitTest
 			Assert::IsTrue(ut.DumpDecoder());
 		}
 
-		BEGIN_TEST_METHOD_ATTRIBUTE(TestCoreMegaCycles)
-			TEST_IGNORE()
-		END_TEST_METHOD_ATTRIBUTE()
+		//BEGIN_TEST_METHOD_ATTRIBUTE(TestCoreMegaCycles)
+		//	TEST_IGNORE()
+		//END_TEST_METHOD_ATTRIBUTE()
 		TEST_METHOD(TestCoreMegaCycles)
 		{
 			M6502CoreUnitTest::UnitTest ut;
@@ -146,9 +146,9 @@ namespace UnitTest
 			Assert::IsTrue(ut.TestOAM_DMA());
 		}
 
-		BEGIN_TEST_METHOD_ATTRIBUTE(TestApuMegaCycles)
-			TEST_IGNORE()
-		END_TEST_METHOD_ATTRIBUTE()
+		//BEGIN_TEST_METHOD_ATTRIBUTE(TestApuMegaCycles)
+		//	TEST_IGNORE()
+		//END_TEST_METHOD_ATTRIBUTE()
 		TEST_METHOD(TestApuMegaCycles)
 		{
 			APUSimUnitTest::UnitTest ut(APUSim::Revision::RP2A03G);
@@ -294,9 +294,9 @@ namespace UnitTest
 			ut.Dump_2C04_0003_ColorSpace();
 		}
 
-		BEGIN_TEST_METHOD_ATTRIBUTE(TestPpuMegaCycles)
-			TEST_IGNORE()
-		END_TEST_METHOD_ATTRIBUTE()
+		//BEGIN_TEST_METHOD_ATTRIBUTE(TestPpuMegaCycles)
+		//	TEST_IGNORE()
+		//END_TEST_METHOD_ATTRIBUTE()
 		TEST_METHOD(TestPpuMegaCycles)
 		{
 			PPUSimUnitTest::UnitTest ut(PPUSim::Revision::RP2C02G);